[INFO] cloning repository https://github.com/Thesecondbestname/typechecker
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Thesecondbestname/typechecker" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FThesecondbestname%2Ftypechecker", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FThesecondbestname%2Ftypechecker'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 238533c57fd55ff7b03b2f3b09eb05f6b433ecb3
[INFO] testing Thesecondbestname/typechecker against try#db823df02fd0c2cf67b43025ac3fef3f2d743245 for pr-150681
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FThesecondbestname%2Ftypechecker" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Thesecondbestname/typechecker
[INFO] finished tweaking git repo https://github.com/Thesecondbestname/typechecker
[INFO] tweaked toml for git repo https://github.com/Thesecondbestname/typechecker written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Thesecondbestname/typechecker on toolchain db823df02fd0c2cf67b43025ac3fef3f2d743245
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Thesecondbestname/typechecker already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ce286ea2b5b07aba5e7810a50a8ddbe12b0db7a53cc6f7a4463aaae35d8c6051
[INFO] running `Command { std: "docker" "start" "-a" "ce286ea2b5b07aba5e7810a50a8ddbe12b0db7a53cc6f7a4463aaae35d8c6051", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ce286ea2b5b07aba5e7810a50a8ddbe12b0db7a53cc6f7a4463aaae35d8c6051", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce286ea2b5b07aba5e7810a50a8ddbe12b0db7a53cc6f7a4463aaae35d8c6051", kill_on_drop: false }`
[INFO] [stdout] ce286ea2b5b07aba5e7810a50a8ddbe12b0db7a53cc6f7a4463aaae35d8c6051
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22400081a0ccbbb1eef190b725606ffbc5c4c98359b47f4025b8d93eb424c072
[INFO] running `Command { std: "docker" "start" "-a" "22400081a0ccbbb1eef190b725606ffbc5c4c98359b47f4025b8d93eb424c072", kill_on_drop: false }`
[INFO] [stderr]    Compiling type_checker v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/resolve_names.rs:165:42
[INFO] [stdout]     |
[INFO] [stdout] 165 |                 Expr::Functor(n, ast) => (Expr::Functor(n, self.resolve_ident_names(*ast).into())),
[INFO] [stdout]     |                                          ^                                                       ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 165 -                 Expr::Functor(n, ast) => (Expr::Functor(n, self.resolve_ident_names(*ast).into())),
[INFO] [stdout] 165 +                 Expr::Functor(n, ast) => Expr::Functor(n, self.resolve_ident_names(*ast).into()) ,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/resolve_names.rs:180:36
[INFO] [stdout]     |
[INFO] [stdout] 180 |                 Expr::LitInt(i) => (Expr::LitInt(i)),
[INFO] [stdout]     |                                    ^               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 180 -                 Expr::LitInt(i) => (Expr::LitInt(i)),
[INFO] [stdout] 180 +                 Expr::LitInt(i) => Expr::LitInt(i) ,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `resolve_names::debrujin::resolve_names`
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use resolve_names::debrujin::resolve_names;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alpha`
[INFO] [stdout]   --> src/types.rs:83:38
[INFO] [stdout]    |
[INFO] [stdout] 83 |             ContextElement::Variable(alpha) => false,
[INFO] [stdout]    |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_alpha`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/types.rs:84:43
[INFO] [stdout]    |
[INFO] [stdout] 84 |             ContextElement::TypedVariable(var, ty) => self.is_well_formed(ty),
[INFO] [stdout]    |                                           ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alpha_hat`
[INFO] [stdout]   --> src/types.rs:85:41
[INFO] [stdout]    |
[INFO] [stdout] 85 |             ContextElement::Existential(alpha_hat) => false,
[INFO] [stdout]    |                                         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alpha_hat`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/types.rs:86:36
[INFO] [stdout]    |
[INFO] [stdout] 86 |             ContextElement::Solved(var, ty) => self.is_well_formed(ty),
[INFO] [stdout]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name1`
[INFO] [stdout]    --> src/lib.rs:575:29
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_name1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `open`
[INFO] [stdout]    --> src/lib.rs:575:40
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_open`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name2`
[INFO] [stdout]    --> src/lib.rs:575:66
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                                                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_name2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `open2`
[INFO] [stdout]    --> src/lib.rs:575:77
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_open2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `TCContext` is more private than the item `check`
[INFO] [stdout]    --> src/lib.rs:262:1
[INFO] [stdout]     |
[INFO] [stdout] 262 | / pub fn check(
[INFO] [stdout] 263 | |     e: Expr<VarId>,
[INFO] [stdout] 264 | |     ty: Type<VarId>,
[INFO] [stdout] 265 | |     ctx: TCContext,
[INFO] [stdout] 266 | | ) -> Result<(Expr<TypedVar>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |____________________________________________________________________^ function `check` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `TCContext` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:51:1
[INFO] [stdout]     |
[INFO] [stdout]  51 | pub(crate) struct TCContext {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `CheckingError` is more private than the item `check`
[INFO] [stdout]    --> src/lib.rs:262:1
[INFO] [stdout]     |
[INFO] [stdout] 262 | / pub fn check(
[INFO] [stdout] 263 | |     e: Expr<VarId>,
[INFO] [stdout] 264 | |     ty: Type<VarId>,
[INFO] [stdout] 265 | |     ctx: TCContext,
[INFO] [stdout] 266 | | ) -> Result<(Expr<TypedVar>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |____________________________________________________________________^ function `check` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `CheckingError` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:59:1
[INFO] [stdout]     |
[INFO] [stdout]  59 | pub(crate) enum CheckingError {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `TCContext` is more private than the item `synth`
[INFO] [stdout]    --> src/lib.rs:323:1
[INFO] [stdout]     |
[INFO] [stdout] 323 | / pub fn synth(
[INFO] [stdout] 324 | |     e: Expr<VarId>,
[INFO] [stdout] 325 | |     mut ctx: TCContext,
[INFO] [stdout] 326 | | ) -> Result<(Expr<TypedVar>, Type<VarId>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |_________________________________________________________________________________^ function `synth` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `TCContext` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:51:1
[INFO] [stdout]     |
[INFO] [stdout]  51 | pub(crate) struct TCContext {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `CheckingError` is more private than the item `synth`
[INFO] [stdout]    --> src/lib.rs:323:1
[INFO] [stdout]     |
[INFO] [stdout] 323 | / pub fn synth(
[INFO] [stdout] 324 | |     e: Expr<VarId>,
[INFO] [stdout] 325 | |     mut ctx: TCContext,
[INFO] [stdout] 326 | | ) -> Result<(Expr<TypedVar>, Type<VarId>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |_________________________________________________________________________________^ function `synth` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `CheckingError` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:59:1
[INFO] [stdout]     |
[INFO] [stdout]  59 | pub(crate) enum CheckingError {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `begin_scope_with` are never used
[INFO] [stdout]   --> src/lib.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl TCContext {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 21 |     const fn new() -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn begin_scope_with(mut self, elem: ContextElement) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `id_fn` is never used
[INFO] [stdout]    --> src/lib.rs:811:4
[INFO] [stdout]     |
[INFO] [stdout] 811 | fn id_fn() -> Expr<String> {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Var` is never constructed
[INFO] [stdout]  --> src/lower.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Var(VarId, Type);
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VarId` is never constructed
[INFO] [stdout]  --> src/lower.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct VarId(usize);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constant `INCOMPARABLE` is never used
[INFO] [stdout]  --> src/lower.rs:6:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl VarId {
[INFO] [stdout]   | ---------- associated constant in this implementation
[INFO] [stdout] 6 |     const INCOMPARABLE: Self = Self(usize::MAX);
[INFO] [stdout]   |           ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Kind` is never used
[INFO] [stdout]  --> src/lower.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum Kind {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Type` is never used
[INFO] [stdout]   --> src/lower.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Type {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SystemF` is never used
[INFO] [stdout]   --> src/lower.rs:32:6
[INFO] [stdout]    |
[INFO] [stdout] 32 | enum SystemF {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LowerTypes` is never constructed
[INFO] [stdout]   --> src/lower.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | struct LowerTypes {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `incr_index`, `store_var`, and `lookup_var` are never used
[INFO] [stdout]   --> src/lower.rs:46:14
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl LowerTypes {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 46 |     const fn incr_index(&mut self) -> VarId {
[INFO] [stdout]    |              ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |     fn store_var(&mut self, id: crate::VarId, item: VarId) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     fn lookup_var(&self, id: crate::VarId) -> VarId {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `resolve_names` is never used
[INFO] [stdout]  --> src/resolve_names.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub fn resolve_names(ast: Expr<String>) -> (Expr<VarId>, Vec<String>) {
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VarContext` is never constructed
[INFO] [stdout]   --> src/resolve_names.rs:18:23
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub(crate) struct VarContext {
[INFO] [stdout]    |                       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `lookup_var`, `lookup_ty`, `fresh_id`, `resolve_names_shadowing`, `resolve_type`, and `resolve_ident_names` are never used
[INFO] [stdout]   --> src/resolve_names.rs:25:23
[INFO] [stdout]    |
[INFO] [stdout] 24 |     impl VarContext {
[INFO] [stdout]    |     --------------- methods in this implementation
[INFO] [stdout] 25 |         pub(crate) fn lookup_var(&self, var: &str) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |         pub(crate) fn lookup_ty(&self, var: &str) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |         pub(crate) fn fresh_id(&mut self, name: String) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |         pub(crate) fn resolve_names_shadowing(
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 53 |         pub(crate) fn resolve_type(&mut self, ty: Type<String>) -> Type<VarId> {
[INFO] [stdout]    |                       ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |         pub(crate) fn resolve_ident_names(&mut self, ast: Expr<String>) -> Expr<VarId> {
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VarContext` is never constructed
[INFO] [stdout]    --> src/resolve_names.rs:124:12
[INFO] [stdout]     |
[INFO] [stdout] 124 |     struct VarContext {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `resolve_names` is never used
[INFO] [stdout]    --> src/resolve_names.rs:130:12
[INFO] [stdout]     |
[INFO] [stdout] 130 |     pub fn resolve_names(ast: Expr<String>) -> (Expr<VarId>, Vec<String>) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/resolve_names.rs:141:18
[INFO] [stdout]     |
[INFO] [stdout] 140 |     impl VarContext {
[INFO] [stdout]     |     --------------- methods in this implementation
[INFO] [stdout] 141 |         const fn get_index(&self) -> VarId {
[INFO] [stdout]     |                  ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 144 |         fn resolve_ident_names(&mut self, ast: Expr<String>) -> Expr<VarId> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 183 |         const fn new_scope(&mut self) {
[INFO] [stdout]     |                  ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |         fn lookup_var(&self, var: &str) -> VarId {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 191 |         fn resolve_names_shadowing(&mut self, ast: Expr<String>, name: String) -> Expr<VarId> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 200 |         const fn incr_index(&mut self) {
[INFO] [stdout]     |                  ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 203 |         fn resolve_type(&mut self, ty: Type<String>) -> Type<VarId> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:60:25
[INFO] [stdout]    |
[INFO] [stdout] 60 |     UnannotatedVariable(VarId),
[INFO] [stdout]    |     ------------------- ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 60 -     UnannotatedVariable(VarId),
[INFO] [stdout] 60 +     UnannotatedVariable(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:61:32
[INFO] [stdout]    |
[INFO] [stdout] 61 |     DoubelyInitializedVariable(VarId),
[INFO] [stdout]    |     -------------------------- ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 61 -     DoubelyInitializedVariable(VarId),
[INFO] [stdout] 61 +     DoubelyInitializedVariable(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:63:19
[INFO] [stdout]    |
[INFO] [stdout] 63 |     TypeMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 63 -     TypeMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout] 63 +     TypeMissmatch((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:64:22
[INFO] [stdout]    |
[INFO] [stdout] 64 |     AllOptionsFailed(Vec<Self>),
[INFO] [stdout]    |     ---------------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 64 -     AllOptionsFailed(Vec<Self>),
[INFO] [stdout] 64 +     AllOptionsFailed(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:65:26
[INFO] [stdout]    |
[INFO] [stdout] 65 |     InvalidInstantiation(Type<VarId>, String),
[INFO] [stdout]    |     -------------------- ^^^^^^^^^^^  ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 65 -     InvalidInstantiation(Type<VarId>, String),
[INFO] [stdout] 65 +     InvalidInstantiation((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:66:19
[INFO] [stdout]    |
[INFO] [stdout] 66 |     NotWellFormed(Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 66 -     NotWellFormed(Type<VarId>),
[INFO] [stdout] 66 +     NotWellFormed(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:67:22
[INFO] [stdout]    |
[INFO] [stdout] 67 |     MissmatchedArity(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ---------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 67 -     MissmatchedArity(Type<VarId>, Type<VarId>),
[INFO] [stdout] 67 +     MissmatchedArity((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:68:19
[INFO] [stdout]    |
[INFO] [stdout] 68 |     KindMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 68 -     KindMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout] 68 +     KindMissmatch((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_type` is never used
[INFO] [stdout]   --> src/types.rs:71:12
[INFO] [stdout]    |
[INFO] [stdout] 70 | impl ContextElement {
[INFO] [stdout]    | ------------------- method in this implementation
[INFO] [stdout] 71 |     pub fn to_type(self) -> TypedVar {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_complete` is never used
[INFO] [stdout]   --> src/types.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 79 | impl TCContext {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 80 |     pub fn is_complete(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.83s
[INFO] running `Command { std: "docker" "inspect" "22400081a0ccbbb1eef190b725606ffbc5c4c98359b47f4025b8d93eb424c072", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22400081a0ccbbb1eef190b725606ffbc5c4c98359b47f4025b8d93eb424c072", kill_on_drop: false }`
[INFO] [stdout] 22400081a0ccbbb1eef190b725606ffbc5c4c98359b47f4025b8d93eb424c072
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 886a35025d216f7d7c9f14d511634817b668511060559ff30035514cd9c0c563
[INFO] running `Command { std: "docker" "start" "-a" "886a35025d216f7d7c9f14d511634817b668511060559ff30035514cd9c0c563", kill_on_drop: false }`
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/resolve_names.rs:165:42
[INFO] [stdout]     |
[INFO] [stdout] 165 |                 Expr::Functor(n, ast) => (Expr::Functor(n, self.resolve_ident_names(*ast).into())),
[INFO] [stdout]     |                                          ^                                                       ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 165 -                 Expr::Functor(n, ast) => (Expr::Functor(n, self.resolve_ident_names(*ast).into())),
[INFO] [stdout] 165 +                 Expr::Functor(n, ast) => Expr::Functor(n, self.resolve_ident_names(*ast).into()) ,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/resolve_names.rs:180:36
[INFO] [stdout]     |
[INFO] [stdout] 180 |                 Expr::LitInt(i) => (Expr::LitInt(i)),
[INFO] [stdout]     |                                    ^               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 180 -                 Expr::LitInt(i) => (Expr::LitInt(i)),
[INFO] [stdout] 180 +                 Expr::LitInt(i) => Expr::LitInt(i) ,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `resolve_names::debrujin::resolve_names`
[INFO] [stdout]  --> src/lib.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use resolve_names::debrujin::resolve_names;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alpha`
[INFO] [stdout]   --> src/types.rs:83:38
[INFO] [stdout]    |
[INFO] [stdout] 83 |             ContextElement::Variable(alpha) => false,
[INFO] [stdout]    |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_alpha`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/types.rs:84:43
[INFO] [stdout]    |
[INFO] [stdout] 84 |             ContextElement::TypedVariable(var, ty) => self.is_well_formed(ty),
[INFO] [stdout]    |                                           ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alpha_hat`
[INFO] [stdout]   --> src/types.rs:85:41
[INFO] [stdout]    |
[INFO] [stdout] 85 |             ContextElement::Existential(alpha_hat) => false,
[INFO] [stdout]    |                                         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alpha_hat`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/types.rs:86:36
[INFO] [stdout]    |
[INFO] [stdout] 86 |             ContextElement::Solved(var, ty) => self.is_well_formed(ty),
[INFO] [stdout]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name1`
[INFO] [stdout]    --> src/lib.rs:575:29
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_name1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `open`
[INFO] [stdout]    --> src/lib.rs:575:40
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_open`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name2`
[INFO] [stdout]    --> src/lib.rs:575:66
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                                                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_name2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `open2`
[INFO] [stdout]    --> src/lib.rs:575:77
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_open2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `TCContext` is more private than the item `check`
[INFO] [stdout]    --> src/lib.rs:262:1
[INFO] [stdout]     |
[INFO] [stdout] 262 | / pub fn check(
[INFO] [stdout] 263 | |     e: Expr<VarId>,
[INFO] [stdout] 264 | |     ty: Type<VarId>,
[INFO] [stdout] 265 | |     ctx: TCContext,
[INFO] [stdout] 266 | | ) -> Result<(Expr<TypedVar>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |____________________________________________________________________^ function `check` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `TCContext` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:51:1
[INFO] [stdout]     |
[INFO] [stdout]  51 | pub(crate) struct TCContext {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `CheckingError` is more private than the item `check`
[INFO] [stdout]    --> src/lib.rs:262:1
[INFO] [stdout]     |
[INFO] [stdout] 262 | / pub fn check(
[INFO] [stdout] 263 | |     e: Expr<VarId>,
[INFO] [stdout] 264 | |     ty: Type<VarId>,
[INFO] [stdout] 265 | |     ctx: TCContext,
[INFO] [stdout] 266 | | ) -> Result<(Expr<TypedVar>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |____________________________________________________________________^ function `check` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `CheckingError` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:59:1
[INFO] [stdout]     |
[INFO] [stdout]  59 | pub(crate) enum CheckingError {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `TCContext` is more private than the item `synth`
[INFO] [stdout]    --> src/lib.rs:323:1
[INFO] [stdout]     |
[INFO] [stdout] 323 | / pub fn synth(
[INFO] [stdout] 324 | |     e: Expr<VarId>,
[INFO] [stdout] 325 | |     mut ctx: TCContext,
[INFO] [stdout] 326 | | ) -> Result<(Expr<TypedVar>, Type<VarId>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |_________________________________________________________________________________^ function `synth` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `TCContext` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:51:1
[INFO] [stdout]     |
[INFO] [stdout]  51 | pub(crate) struct TCContext {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `CheckingError` is more private than the item `synth`
[INFO] [stdout]    --> src/lib.rs:323:1
[INFO] [stdout]     |
[INFO] [stdout] 323 | / pub fn synth(
[INFO] [stdout] 324 | |     e: Expr<VarId>,
[INFO] [stdout] 325 | |     mut ctx: TCContext,
[INFO] [stdout] 326 | | ) -> Result<(Expr<TypedVar>, Type<VarId>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |_________________________________________________________________________________^ function `synth` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `CheckingError` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:59:1
[INFO] [stdout]     |
[INFO] [stdout]  59 | pub(crate) enum CheckingError {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `begin_scope_with` are never used
[INFO] [stdout]   --> src/lib.rs:21:14
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl TCContext {
[INFO] [stdout]    | -------------- associated items in this implementation
[INFO] [stdout] 21 |     const fn new() -> Self {
[INFO] [stdout]    |              ^^^
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn begin_scope_with(mut self, elem: ContextElement) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `id_fn` is never used
[INFO] [stdout]    --> src/lib.rs:811:4
[INFO] [stdout]     |
[INFO] [stdout] 811 | fn id_fn() -> Expr<String> {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Var` is never constructed
[INFO] [stdout]  --> src/lower.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Var(VarId, Type);
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VarId` is never constructed
[INFO] [stdout]  --> src/lower.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct VarId(usize);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constant `INCOMPARABLE` is never used
[INFO] [stdout]  --> src/lower.rs:6:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl VarId {
[INFO] [stdout]   | ---------- associated constant in this implementation
[INFO] [stdout] 6 |     const INCOMPARABLE: Self = Self(usize::MAX);
[INFO] [stdout]   |           ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Kind` is never used
[INFO] [stdout]  --> src/lower.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum Kind {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Type` is never used
[INFO] [stdout]   --> src/lower.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Type {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SystemF` is never used
[INFO] [stdout]   --> src/lower.rs:32:6
[INFO] [stdout]    |
[INFO] [stdout] 32 | enum SystemF {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LowerTypes` is never constructed
[INFO] [stdout]   --> src/lower.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | struct LowerTypes {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `incr_index`, `store_var`, and `lookup_var` are never used
[INFO] [stdout]   --> src/lower.rs:46:14
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl LowerTypes {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 46 |     const fn incr_index(&mut self) -> VarId {
[INFO] [stdout]    |              ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |     fn store_var(&mut self, id: crate::VarId, item: VarId) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     fn lookup_var(&self, id: crate::VarId) -> VarId {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `resolve_names` is never used
[INFO] [stdout]  --> src/resolve_names.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub fn resolve_names(ast: Expr<String>) -> (Expr<VarId>, Vec<String>) {
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VarContext` is never constructed
[INFO] [stdout]   --> src/resolve_names.rs:18:23
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub(crate) struct VarContext {
[INFO] [stdout]    |                       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `lookup_var`, `lookup_ty`, `fresh_id`, `resolve_names_shadowing`, `resolve_type`, and `resolve_ident_names` are never used
[INFO] [stdout]   --> src/resolve_names.rs:25:23
[INFO] [stdout]    |
[INFO] [stdout] 24 |     impl VarContext {
[INFO] [stdout]    |     --------------- methods in this implementation
[INFO] [stdout] 25 |         pub(crate) fn lookup_var(&self, var: &str) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |         pub(crate) fn lookup_ty(&self, var: &str) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |         pub(crate) fn fresh_id(&mut self, name: String) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |         pub(crate) fn resolve_names_shadowing(
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 53 |         pub(crate) fn resolve_type(&mut self, ty: Type<String>) -> Type<VarId> {
[INFO] [stdout]    |                       ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |         pub(crate) fn resolve_ident_names(&mut self, ast: Expr<String>) -> Expr<VarId> {
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VarContext` is never constructed
[INFO] [stdout]    --> src/resolve_names.rs:124:12
[INFO] [stdout]     |
[INFO] [stdout] 124 |     struct VarContext {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `resolve_names` is never used
[INFO] [stdout]    --> src/resolve_names.rs:130:12
[INFO] [stdout]     |
[INFO] [stdout] 130 |     pub fn resolve_names(ast: Expr<String>) -> (Expr<VarId>, Vec<String>) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple methods are never used
[INFO] [stdout]    --> src/resolve_names.rs:141:18
[INFO] [stdout]     |
[INFO] [stdout] 140 |     impl VarContext {
[INFO] [stdout]     |     --------------- methods in this implementation
[INFO] [stdout] 141 |         const fn get_index(&self) -> VarId {
[INFO] [stdout]     |                  ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 144 |         fn resolve_ident_names(&mut self, ast: Expr<String>) -> Expr<VarId> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 183 |         const fn new_scope(&mut self) {
[INFO] [stdout]     |                  ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 186 |         fn lookup_var(&self, var: &str) -> VarId {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 191 |         fn resolve_names_shadowing(&mut self, ast: Expr<String>, name: String) -> Expr<VarId> {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 200 |         const fn incr_index(&mut self) {
[INFO] [stdout]     |                  ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 203 |         fn resolve_type(&mut self, ty: Type<String>) -> Type<VarId> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:60:25
[INFO] [stdout]    |
[INFO] [stdout] 60 |     UnannotatedVariable(VarId),
[INFO] [stdout]    |     ------------------- ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 60 -     UnannotatedVariable(VarId),
[INFO] [stdout] 60 +     UnannotatedVariable(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:61:32
[INFO] [stdout]    |
[INFO] [stdout] 61 |     DoubelyInitializedVariable(VarId),
[INFO] [stdout]    |     -------------------------- ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 61 -     DoubelyInitializedVariable(VarId),
[INFO] [stdout] 61 +     DoubelyInitializedVariable(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:63:19
[INFO] [stdout]    |
[INFO] [stdout] 63 |     TypeMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 63 -     TypeMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout] 63 +     TypeMissmatch((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:64:22
[INFO] [stdout]    |
[INFO] [stdout] 64 |     AllOptionsFailed(Vec<Self>),
[INFO] [stdout]    |     ---------------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 64 -     AllOptionsFailed(Vec<Self>),
[INFO] [stdout] 64 +     AllOptionsFailed(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:65:26
[INFO] [stdout]    |
[INFO] [stdout] 65 |     InvalidInstantiation(Type<VarId>, String),
[INFO] [stdout]    |     -------------------- ^^^^^^^^^^^  ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 65 -     InvalidInstantiation(Type<VarId>, String),
[INFO] [stdout] 65 +     InvalidInstantiation((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:66:19
[INFO] [stdout]    |
[INFO] [stdout] 66 |     NotWellFormed(Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 66 -     NotWellFormed(Type<VarId>),
[INFO] [stdout] 66 +     NotWellFormed(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:67:22
[INFO] [stdout]    |
[INFO] [stdout] 67 |     MissmatchedArity(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ---------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 67 -     MissmatchedArity(Type<VarId>, Type<VarId>),
[INFO] [stdout] 67 +     MissmatchedArity((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:68:19
[INFO] [stdout]    |
[INFO] [stdout] 68 |     KindMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 68 -     KindMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout] 68 +     KindMissmatch((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_type` is never used
[INFO] [stdout]   --> src/types.rs:71:12
[INFO] [stdout]    |
[INFO] [stdout] 70 | impl ContextElement {
[INFO] [stdout]    | ------------------- method in this implementation
[INFO] [stdout] 71 |     pub fn to_type(self) -> TypedVar {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_complete` is never used
[INFO] [stdout]   --> src/types.rs:80:12
[INFO] [stdout]    |
[INFO] [stdout] 79 | impl TCContext {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 80 |     pub fn is_complete(&self) -> bool {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling type_checker v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/resolve_names.rs:165:42
[INFO] [stdout]     |
[INFO] [stdout] 165 |                 Expr::Functor(n, ast) => (Expr::Functor(n, self.resolve_ident_names(*ast).into())),
[INFO] [stdout]     |                                          ^                                                       ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 165 -                 Expr::Functor(n, ast) => (Expr::Functor(n, self.resolve_ident_names(*ast).into())),
[INFO] [stdout] 165 +                 Expr::Functor(n, ast) => Expr::Functor(n, self.resolve_ident_names(*ast).into()) ,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around match arm expression
[INFO] [stdout]    --> src/resolve_names.rs:180:36
[INFO] [stdout]     |
[INFO] [stdout] 180 |                 Expr::LitInt(i) => (Expr::LitInt(i)),
[INFO] [stdout]     |                                    ^               ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 180 -                 Expr::LitInt(i) => (Expr::LitInt(i)),
[INFO] [stdout] 180 +                 Expr::LitInt(i) => Expr::LitInt(i) ,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]    --> src/lib.rs:918:5
[INFO] [stdout]     |
[INFO] [stdout] 917 |     panic!();
[INFO] [stdout]     |     -------- any code following this expression is unreachable
[INFO] [stdout] 918 |     Ok(())
[INFO] [stdout]     |     ^^^^^^ unreachable expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alpha`
[INFO] [stdout]   --> src/types.rs:83:38
[INFO] [stdout]    |
[INFO] [stdout] 83 |             ContextElement::Variable(alpha) => false,
[INFO] [stdout]    |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_alpha`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/types.rs:84:43
[INFO] [stdout]    |
[INFO] [stdout] 84 |             ContextElement::TypedVariable(var, ty) => self.is_well_formed(ty),
[INFO] [stdout]    |                                           ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `alpha_hat`
[INFO] [stdout]   --> src/types.rs:85:41
[INFO] [stdout]    |
[INFO] [stdout] 85 |             ContextElement::Existential(alpha_hat) => false,
[INFO] [stdout]    |                                         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alpha_hat`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var`
[INFO] [stdout]   --> src/types.rs:86:36
[INFO] [stdout]    |
[INFO] [stdout] 86 |             ContextElement::Solved(var, ty) => self.is_well_formed(ty),
[INFO] [stdout]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name1`
[INFO] [stdout]    --> src/lib.rs:575:29
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_name1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `open`
[INFO] [stdout]    --> src/lib.rs:575:40
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_open`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name2`
[INFO] [stdout]    --> src/lib.rs:575:66
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                                                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_name2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `open2`
[INFO] [stdout]    --> src/lib.rs:575:77
[INFO] [stdout]     |
[INFO] [stdout] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stdout]     |                                                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_open2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `TCContext` is more private than the item `check`
[INFO] [stdout]    --> src/lib.rs:262:1
[INFO] [stdout]     |
[INFO] [stdout] 262 | / pub fn check(
[INFO] [stdout] 263 | |     e: Expr<VarId>,
[INFO] [stdout] 264 | |     ty: Type<VarId>,
[INFO] [stdout] 265 | |     ctx: TCContext,
[INFO] [stdout] 266 | | ) -> Result<(Expr<TypedVar>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |____________________________________________________________________^ function `check` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `TCContext` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:51:1
[INFO] [stdout]     |
[INFO] [stdout]  51 | pub(crate) struct TCContext {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `CheckingError` is more private than the item `check`
[INFO] [stdout]    --> src/lib.rs:262:1
[INFO] [stdout]     |
[INFO] [stdout] 262 | / pub fn check(
[INFO] [stdout] 263 | |     e: Expr<VarId>,
[INFO] [stdout] 264 | |     ty: Type<VarId>,
[INFO] [stdout] 265 | |     ctx: TCContext,
[INFO] [stdout] 266 | | ) -> Result<(Expr<TypedVar>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |____________________________________________________________________^ function `check` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `CheckingError` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:59:1
[INFO] [stdout]     |
[INFO] [stdout]  59 | pub(crate) enum CheckingError {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `TCContext` is more private than the item `synth`
[INFO] [stdout]    --> src/lib.rs:323:1
[INFO] [stdout]     |
[INFO] [stdout] 323 | / pub fn synth(
[INFO] [stdout] 324 | |     e: Expr<VarId>,
[INFO] [stdout] 325 | |     mut ctx: TCContext,
[INFO] [stdout] 326 | | ) -> Result<(Expr<TypedVar>, Type<VarId>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |_________________________________________________________________________________^ function `synth` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `TCContext` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:51:1
[INFO] [stdout]     |
[INFO] [stdout]  51 | pub(crate) struct TCContext {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `CheckingError` is more private than the item `synth`
[INFO] [stdout]    --> src/lib.rs:323:1
[INFO] [stdout]     |
[INFO] [stdout] 323 | / pub fn synth(
[INFO] [stdout] 324 | |     e: Expr<VarId>,
[INFO] [stdout] 325 | |     mut ctx: TCContext,
[INFO] [stdout] 326 | | ) -> Result<(Expr<TypedVar>, Type<VarId>, TCContext), (CheckingError, TCContext)> {
[INFO] [stdout]     | |_________________________________________________________________________________^ function `synth` is reachable at visibility `pub`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `CheckingError` is only usable at visibility `pub(crate)`
[INFO] [stdout]    --> src/types.rs:59:1
[INFO] [stdout]     |
[INFO] [stdout]  59 | pub(crate) enum CheckingError {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `begin_scope_with` is never used
[INFO] [stdout]   --> src/lib.rs:71:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | impl TCContext {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 71 |     fn begin_scope_with(mut self, elem: ContextElement) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Var` is never constructed
[INFO] [stdout]  --> src/lower.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct Var(VarId, Type);
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VarId` is never constructed
[INFO] [stdout]  --> src/lower.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct VarId(usize);
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated constant `INCOMPARABLE` is never used
[INFO] [stdout]  --> src/lower.rs:6:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | impl VarId {
[INFO] [stdout]   | ---------- associated constant in this implementation
[INFO] [stdout] 6 |     const INCOMPARABLE: Self = Self(usize::MAX);
[INFO] [stdout]   |           ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Kind` is never used
[INFO] [stdout]  --> src/lower.rs:9:6
[INFO] [stdout]   |
[INFO] [stdout] 9 | enum Kind {
[INFO] [stdout]   |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Type` is never used
[INFO] [stdout]   --> src/lower.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | enum Type {
[INFO] [stdout]    |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `SystemF` is never used
[INFO] [stdout]   --> src/lower.rs:32:6
[INFO] [stdout]    |
[INFO] [stdout] 32 | enum SystemF {
[INFO] [stdout]    |      ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LowerTypes` is never constructed
[INFO] [stdout]   --> src/lower.rs:41:8
[INFO] [stdout]    |
[INFO] [stdout] 41 | struct LowerTypes {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `incr_index`, `store_var`, and `lookup_var` are never used
[INFO] [stdout]   --> src/lower.rs:46:14
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl LowerTypes {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 46 |     const fn incr_index(&mut self) -> VarId {
[INFO] [stdout]    |              ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 51 |     fn store_var(&mut self, id: crate::VarId, item: VarId) {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 54 |     fn lookup_var(&self, id: crate::VarId) -> VarId {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `resolve_names` is never used
[INFO] [stdout]  --> src/resolve_names.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 8 |     pub fn resolve_names(ast: Expr<String>) -> (Expr<VarId>, Vec<String>) {
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `VarContext` is never constructed
[INFO] [stdout]   --> src/resolve_names.rs:18:23
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub(crate) struct VarContext {
[INFO] [stdout]    |                       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `lookup_var`, `lookup_ty`, `fresh_id`, `resolve_names_shadowing`, `resolve_type`, and `resolve_ident_names` are never used
[INFO] [stdout]   --> src/resolve_names.rs:25:23
[INFO] [stdout]    |
[INFO] [stdout] 24 |     impl VarContext {
[INFO] [stdout]    |     --------------- methods in this implementation
[INFO] [stdout] 25 |         pub(crate) fn lookup_var(&self, var: &str) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 30 |         pub(crate) fn lookup_ty(&self, var: &str) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |         pub(crate) fn fresh_id(&mut self, name: String) -> VarId {
[INFO] [stdout]    |                       ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 40 |         pub(crate) fn resolve_names_shadowing(
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 53 |         pub(crate) fn resolve_type(&mut self, ty: Type<String>) -> Type<VarId> {
[INFO] [stdout]    |                       ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 88 |         pub(crate) fn resolve_ident_names(&mut self, ast: Expr<String>) -> Expr<VarId> {
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `ty_scope` is never read
[INFO] [stdout]    --> src/resolve_names.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 124 |     struct VarContext {
[INFO] [stdout]     |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 128 |         ty_scope: usize,
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:60:25
[INFO] [stdout]    |
[INFO] [stdout] 60 |     UnannotatedVariable(VarId),
[INFO] [stdout]    |     ------------------- ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 60 -     UnannotatedVariable(VarId),
[INFO] [stdout] 60 +     UnannotatedVariable(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:61:32
[INFO] [stdout]    |
[INFO] [stdout] 61 |     DoubelyInitializedVariable(VarId),
[INFO] [stdout]    |     -------------------------- ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 61 -     DoubelyInitializedVariable(VarId),
[INFO] [stdout] 61 +     DoubelyInitializedVariable(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:63:19
[INFO] [stdout]    |
[INFO] [stdout] 63 |     TypeMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 63 -     TypeMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout] 63 +     TypeMissmatch((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:64:22
[INFO] [stdout]    |
[INFO] [stdout] 64 |     AllOptionsFailed(Vec<Self>),
[INFO] [stdout]    |     ---------------- ^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 64 -     AllOptionsFailed(Vec<Self>),
[INFO] [stdout] 64 +     AllOptionsFailed(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:65:26
[INFO] [stdout]    |
[INFO] [stdout] 65 |     InvalidInstantiation(Type<VarId>, String),
[INFO] [stdout]    |     -------------------- ^^^^^^^^^^^  ^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 65 -     InvalidInstantiation(Type<VarId>, String),
[INFO] [stdout] 65 +     InvalidInstantiation((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/types.rs:66:19
[INFO] [stdout]    |
[INFO] [stdout] 66 |     NotWellFormed(Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 66 -     NotWellFormed(Type<VarId>),
[INFO] [stdout] 66 +     NotWellFormed(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:67:22
[INFO] [stdout]    |
[INFO] [stdout] 67 |     MissmatchedArity(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ---------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 67 -     MissmatchedArity(Type<VarId>, Type<VarId>),
[INFO] [stdout] 67 +     MissmatchedArity((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]   --> src/types.rs:68:19
[INFO] [stdout]    |
[INFO] [stdout] 68 |     KindMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout]    |     ------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     fields in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]    |
[INFO] [stdout] 68 -     KindMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stdout] 68 +     KindMissmatch((), ()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `to_type` is never used
[INFO] [stdout]   --> src/types.rs:71:12
[INFO] [stdout]    |
[INFO] [stdout] 70 | impl ContextElement {
[INFO] [stdout]    | ------------------- method in this implementation
[INFO] [stdout] 71 |     pub fn to_type(self) -> TypedVar {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.32s
[INFO] running `Command { std: "docker" "inspect" "886a35025d216f7d7c9f14d511634817b668511060559ff30035514cd9c0c563", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "886a35025d216f7d7c9f14d511634817b668511060559ff30035514cd9c0c563", kill_on_drop: false }`
[INFO] [stdout] 886a35025d216f7d7c9f14d511634817b668511060559ff30035514cd9c0c563
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:845e597a41426bbf2703be69acdb67d10b6de511142d05cba7bbe119c898b2c7" "/opt/rustwide/cargo-home/bin/cargo" "+db823df02fd0c2cf67b43025ac3fef3f2d743245" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 9c2e57b4cd3f43b11df0ca79b8e7e909d6bd859c9e8d3494b02b5c2520f3f759
[INFO] running `Command { std: "docker" "start" "-a" "9c2e57b4cd3f43b11df0ca79b8e7e909d6bd859c9e8d3494b02b5c2520f3f759", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary parentheses around match arm expression
[INFO] [stderr]    --> src/resolve_names.rs:165:42
[INFO] [stderr]     |
[INFO] [stderr] 165 |                 Expr::Functor(n, ast) => (Expr::Functor(n, self.resolve_ident_names(*ast).into())),
[INFO] [stderr]     |                                          ^                                                       ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 165 -                 Expr::Functor(n, ast) => (Expr::Functor(n, self.resolve_ident_names(*ast).into())),
[INFO] [stderr] 165 +                 Expr::Functor(n, ast) => Expr::Functor(n, self.resolve_ident_names(*ast).into()) ,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around match arm expression
[INFO] [stderr]    --> src/resolve_names.rs:180:36
[INFO] [stderr]     |
[INFO] [stderr] 180 |                 Expr::LitInt(i) => (Expr::LitInt(i)),
[INFO] [stderr]     |                                    ^               ^
[INFO] [stderr]     |
[INFO] [stderr] help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr] 180 -                 Expr::LitInt(i) => (Expr::LitInt(i)),
[INFO] [stderr] 180 +                 Expr::LitInt(i) => Expr::LitInt(i) ,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `resolve_names::debrujin::resolve_names`
[INFO] [stderr]  --> src/lib.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use resolve_names::debrujin::resolve_names;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `alpha`
[INFO] [stderr]   --> src/types.rs:83:38
[INFO] [stderr]    |
[INFO] [stderr] 83 |             ContextElement::Variable(alpha) => false,
[INFO] [stderr]    |                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_alpha`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `var`
[INFO] [stderr]   --> src/types.rs:84:43
[INFO] [stderr]    |
[INFO] [stderr] 84 |             ContextElement::TypedVariable(var, ty) => self.is_well_formed(ty),
[INFO] [stderr]    |                                           ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `alpha_hat`
[INFO] [stderr]   --> src/types.rs:85:41
[INFO] [stderr]    |
[INFO] [stderr] 85 |             ContextElement::Existential(alpha_hat) => false,
[INFO] [stderr]    |                                         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_alpha_hat`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `var`
[INFO] [stderr]   --> src/types.rs:86:36
[INFO] [stderr]    |
[INFO] [stderr] 86 |             ContextElement::Solved(var, ty) => self.is_well_formed(ty),
[INFO] [stderr]    |                                    ^^^ help: if this is intentional, prefix it with an underscore: `_var`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name1`
[INFO] [stderr]    --> src/lib.rs:575:29
[INFO] [stderr]     |
[INFO] [stderr] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stderr]     |                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_name1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `open`
[INFO] [stderr]    --> src/lib.rs:575:40
[INFO] [stderr]     |
[INFO] [stderr] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stderr]     |                                        ^^^^ help: if this is intentional, prefix it with an underscore: `_open`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name2`
[INFO] [stderr]    --> src/lib.rs:575:66
[INFO] [stderr]     |
[INFO] [stderr] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stderr]     |                                                                  ^^^^^ help: if this is intentional, prefix it with an underscore: `_name2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `open2`
[INFO] [stderr]    --> src/lib.rs:575:77
[INFO] [stderr]     |
[INFO] [stderr] 575 |         (Type::HigherKinded(name1, v1, open), Type::HigherKinded(name2, v2, open2)) => {
[INFO] [stderr]     |                                                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_open2`
[INFO] [stderr] 
[INFO] [stderr] warning: type `TCContext` is more private than the item `check`
[INFO] [stderr]    --> src/lib.rs:262:1
[INFO] [stderr]     |
[INFO] [stderr] 262 | / pub fn check(
[INFO] [stderr] 263 | |     e: Expr<VarId>,
[INFO] [stderr] 264 | |     ty: Type<VarId>,
[INFO] [stderr] 265 | |     ctx: TCContext,
[INFO] [stderr] 266 | | ) -> Result<(Expr<TypedVar>, TCContext), (CheckingError, TCContext)> {
[INFO] [stderr]     | |____________________________________________________________________^ function `check` is reachable at visibility `pub`
[INFO] [stderr]     |
[INFO] [stderr] note: but type `TCContext` is only usable at visibility `pub(crate)`
[INFO] [stderr]    --> src/types.rs:51:1
[INFO] [stderr]     |
[INFO] [stderr]  51 | pub(crate) struct TCContext {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `CheckingError` is more private than the item `check`
[INFO] [stderr]    --> src/lib.rs:262:1
[INFO] [stderr]     |
[INFO] [stderr] 262 | / pub fn check(
[INFO] [stderr] 263 | |     e: Expr<VarId>,
[INFO] [stderr] 264 | |     ty: Type<VarId>,
[INFO] [stderr] 265 | |     ctx: TCContext,
[INFO] [stderr] 266 | | ) -> Result<(Expr<TypedVar>, TCContext), (CheckingError, TCContext)> {
[INFO] [stderr]     | |____________________________________________________________________^ function `check` is reachable at visibility `pub`
[INFO] [stderr]     |
[INFO] [stderr] note: but type `CheckingError` is only usable at visibility `pub(crate)`
[INFO] [stderr]    --> src/types.rs:59:1
[INFO] [stderr]     |
[INFO] [stderr]  59 | pub(crate) enum CheckingError {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type `TCContext` is more private than the item `synth`
[INFO] [stderr]    --> src/lib.rs:323:1
[INFO] [stderr]     |
[INFO] [stderr] 323 | / pub fn synth(
[INFO] [stderr] 324 | |     e: Expr<VarId>,
[INFO] [stderr] 325 | |     mut ctx: TCContext,
[INFO] [stderr] 326 | | ) -> Result<(Expr<TypedVar>, Type<VarId>, TCContext), (CheckingError, TCContext)> {
[INFO] [stderr]     | |_________________________________________________________________________________^ function `synth` is reachable at visibility `pub`
[INFO] [stderr]     |
[INFO] [stderr] note: but type `TCContext` is only usable at visibility `pub(crate)`
[INFO] [stderr]    --> src/types.rs:51:1
[INFO] [stderr]     |
[INFO] [stderr]  51 | pub(crate) struct TCContext {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type `CheckingError` is more private than the item `synth`
[INFO] [stderr]    --> src/lib.rs:323:1
[INFO] [stderr]     |
[INFO] [stderr] 323 | / pub fn synth(
[INFO] [stderr] 324 | |     e: Expr<VarId>,
[INFO] [stderr] 325 | |     mut ctx: TCContext,
[INFO] [stderr] 326 | | ) -> Result<(Expr<TypedVar>, Type<VarId>, TCContext), (CheckingError, TCContext)> {
[INFO] [stderr]     | |_________________________________________________________________________________^ function `synth` is reachable at visibility `pub`
[INFO] [stderr]     |
[INFO] [stderr] note: but type `CheckingError` is only usable at visibility `pub(crate)`
[INFO] [stderr]    --> src/types.rs:59:1
[INFO] [stderr]     |
[INFO] [stderr]  59 | pub(crate) enum CheckingError {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated items `new` and `begin_scope_with` are never used
[INFO] [stderr]   --> src/lib.rs:21:14
[INFO] [stderr]    |
[INFO] [stderr] 20 | impl TCContext {
[INFO] [stderr]    | -------------- associated items in this implementation
[INFO] [stderr] 21 |     const fn new() -> Self {
[INFO] [stderr]    |              ^^^
[INFO] [stderr] ...
[INFO] [stderr] 71 |     fn begin_scope_with(mut self, elem: ContextElement) -> Self {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `id_fn` is never used
[INFO] [stderr]    --> src/lib.rs:811:4
[INFO] [stderr]     |
[INFO] [stderr] 811 | fn id_fn() -> Expr<String> {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Var` is never constructed
[INFO] [stderr]  --> src/lower.rs:2:8
[INFO] [stderr]   |
[INFO] [stderr] 2 | struct Var(VarId, Type);
[INFO] [stderr]   |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `VarId` is never constructed
[INFO] [stderr]  --> src/lower.rs:4:8
[INFO] [stderr]   |
[INFO] [stderr] 4 | struct VarId(usize);
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated constant `INCOMPARABLE` is never used
[INFO] [stderr]  --> src/lower.rs:6:11
[INFO] [stderr]   |
[INFO] [stderr] 5 | impl VarId {
[INFO] [stderr]   | ---------- associated constant in this implementation
[INFO] [stderr] 6 |     const INCOMPARABLE: Self = Self(usize::MAX);
[INFO] [stderr]   |           ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Kind` is never used
[INFO] [stderr]  --> src/lower.rs:9:6
[INFO] [stderr]   |
[INFO] [stderr] 9 | enum Kind {
[INFO] [stderr]   |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `Type` is never used
[INFO] [stderr]   --> src/lower.rs:14:6
[INFO] [stderr]    |
[INFO] [stderr] 14 | enum Type {
[INFO] [stderr]    |      ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `SystemF` is never used
[INFO] [stderr]   --> src/lower.rs:32:6
[INFO] [stderr]    |
[INFO] [stderr] 32 | enum SystemF {
[INFO] [stderr]    |      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `LowerTypes` is never constructed
[INFO] [stderr]   --> src/lower.rs:41:8
[INFO] [stderr]    |
[INFO] [stderr] 41 | struct LowerTypes {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `incr_index`, `store_var`, and `lookup_var` are never used
[INFO] [stderr]   --> src/lower.rs:46:14
[INFO] [stderr]    |
[INFO] [stderr] 45 | impl LowerTypes {
[INFO] [stderr]    | --------------- methods in this implementation
[INFO] [stderr] 46 |     const fn incr_index(&mut self) -> VarId {
[INFO] [stderr]    |              ^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 51 |     fn store_var(&mut self, id: crate::VarId, item: VarId) {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 54 |     fn lookup_var(&self, id: crate::VarId) -> VarId {
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `resolve_names` is never used
[INFO] [stderr]  --> src/resolve_names.rs:8:12
[INFO] [stderr]   |
[INFO] [stderr] 8 |     pub fn resolve_names(ast: Expr<String>) -> (Expr<VarId>, Vec<String>) {
[INFO] [stderr]   |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `VarContext` is never constructed
[INFO] [stderr]   --> src/resolve_names.rs:18:23
[INFO] [stderr]    |
[INFO] [stderr] 18 |     pub(crate) struct VarContext {
[INFO] [stderr]    |                       ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: methods `lookup_var`, `lookup_ty`, `fresh_id`, `resolve_names_shadowing`, `resolve_type`, and `resolve_ident_names` are never used
[INFO] [stderr]   --> src/resolve_names.rs:25:23
[INFO] [stderr]    |
[INFO] [stderr] 24 |     impl VarContext {
[INFO] [stderr]    |     --------------- methods in this implementation
[INFO] [stderr] 25 |         pub(crate) fn lookup_var(&self, var: &str) -> VarId {
[INFO] [stderr]    |                       ^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 30 |         pub(crate) fn lookup_ty(&self, var: &str) -> VarId {
[INFO] [stderr]    |                       ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 36 |         pub(crate) fn fresh_id(&mut self, name: String) -> VarId {
[INFO] [stderr]    |                       ^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 40 |         pub(crate) fn resolve_names_shadowing(
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 53 |         pub(crate) fn resolve_type(&mut self, ty: Type<String>) -> Type<VarId> {
[INFO] [stderr]    |                       ^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 88 |         pub(crate) fn resolve_ident_names(&mut self, ast: Expr<String>) -> Expr<VarId> {
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `VarContext` is never constructed
[INFO] [stderr]    --> src/resolve_names.rs:124:12
[INFO] [stderr]     |
[INFO] [stderr] 124 |     struct VarContext {
[INFO] [stderr]     |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `resolve_names` is never used
[INFO] [stderr]    --> src/resolve_names.rs:130:12
[INFO] [stderr]     |
[INFO] [stderr] 130 |     pub fn resolve_names(ast: Expr<String>) -> (Expr<VarId>, Vec<String>) {
[INFO] [stderr]     |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: multiple methods are never used
[INFO] [stderr]    --> src/resolve_names.rs:141:18
[INFO] [stderr]     |
[INFO] [stderr] 140 |     impl VarContext {
[INFO] [stderr]     |     --------------- methods in this implementation
[INFO] [stderr] 141 |         const fn get_index(&self) -> VarId {
[INFO] [stderr]     |                  ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 144 |         fn resolve_ident_names(&mut self, ast: Expr<String>) -> Expr<VarId> {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 183 |         const fn new_scope(&mut self) {
[INFO] [stderr]     |                  ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 186 |         fn lookup_var(&self, var: &str) -> VarId {
[INFO] [stderr]     |            ^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 191 |         fn resolve_names_shadowing(&mut self, ast: Expr<String>, name: String) -> Expr<VarId> {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 200 |         const fn incr_index(&mut self) {
[INFO] [stderr]     |                  ^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 203 |         fn resolve_type(&mut self, ty: Type<String>) -> Type<VarId> {
[INFO] [stderr]     |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/types.rs:60:25
[INFO] [stderr]    |
[INFO] [stderr] 60 |     UnannotatedVariable(VarId),
[INFO] [stderr]    |     ------------------- ^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 60 -     UnannotatedVariable(VarId),
[INFO] [stderr] 60 +     UnannotatedVariable(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/types.rs:61:32
[INFO] [stderr]    |
[INFO] [stderr] 61 |     DoubelyInitializedVariable(VarId),
[INFO] [stderr]    |     -------------------------- ^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 61 -     DoubelyInitializedVariable(VarId),
[INFO] [stderr] 61 +     DoubelyInitializedVariable(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: fields `0` and `1` are never read
[INFO] [stderr]   --> src/types.rs:63:19
[INFO] [stderr]    |
[INFO] [stderr] 63 |     TypeMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stderr]    |     ------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     fields in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]    |
[INFO] [stderr] 63 -     TypeMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stderr] 63 +     TypeMissmatch((), ()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/types.rs:64:22
[INFO] [stderr]    |
[INFO] [stderr] 64 |     AllOptionsFailed(Vec<Self>),
[INFO] [stderr]    |     ---------------- ^^^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 64 -     AllOptionsFailed(Vec<Self>),
[INFO] [stderr] 64 +     AllOptionsFailed(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: fields `0` and `1` are never read
[INFO] [stderr]   --> src/types.rs:65:26
[INFO] [stderr]    |
[INFO] [stderr] 65 |     InvalidInstantiation(Type<VarId>, String),
[INFO] [stderr]    |     -------------------- ^^^^^^^^^^^  ^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     fields in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]    |
[INFO] [stderr] 65 -     InvalidInstantiation(Type<VarId>, String),
[INFO] [stderr] 65 +     InvalidInstantiation((), ()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: field `0` is never read
[INFO] [stderr]   --> src/types.rs:66:19
[INFO] [stderr]    |
[INFO] [stderr] 66 |     NotWellFormed(Type<VarId>),
[INFO] [stderr]    |     ------------- ^^^^^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     field in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stderr]    |
[INFO] [stderr] 66 -     NotWellFormed(Type<VarId>),
[INFO] [stderr] 66 +     NotWellFormed(()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: fields `0` and `1` are never read
[INFO] [stderr]   --> src/types.rs:67:22
[INFO] [stderr]    |
[INFO] [stderr] 67 |     MissmatchedArity(Type<VarId>, Type<VarId>),
[INFO] [stderr]    |     ---------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     fields in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]    |
[INFO] [stderr] 67 -     MissmatchedArity(Type<VarId>, Type<VarId>),
[INFO] [stderr] 67 +     MissmatchedArity((), ()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: fields `0` and `1` are never read
[INFO] [stderr]   --> src/types.rs:68:19
[INFO] [stderr]    |
[INFO] [stderr] 68 |     KindMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stderr]    |     ------------- ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr]    |     |
[INFO] [stderr]    |     fields in this variant
[INFO] [stderr]    |
[INFO] [stderr]    = note: `CheckingError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stderr]    |
[INFO] [stderr] 68 -     KindMissmatch(Type<VarId>, Type<VarId>),
[INFO] [stderr] 68 +     KindMissmatch((), ()),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: method `to_type` is never used
[INFO] [stderr]   --> src/types.rs:71:12
[INFO] [stderr]    |
[INFO] [stderr] 70 | impl ContextElement {
[INFO] [stderr]    | ------------------- method in this implementation
[INFO] [stderr] 71 |     pub fn to_type(self) -> TypedVar {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `is_complete` is never used
[INFO] [stderr]   --> src/types.rs:80:12
[INFO] [stderr]    |
[INFO] [stderr] 79 | impl TCContext {
[INFO] [stderr]    | -------------- method in this implementation
[INFO] [stderr] 80 |     pub fn is_complete(&self) -> bool {
[INFO] [stderr]    |            ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `type_checker` (lib) generated 41 warnings (run `cargo fix --lib -p type_checker` to apply 11 suggestions)
[INFO] [stderr] warning: unreachable expression
[INFO] [stderr]    --> src/lib.rs:918:5
[INFO] [stderr]     |
[INFO] [stderr] 917 |     panic!();
[INFO] [stderr]     |     -------- any code following this expression is unreachable
[INFO] [stderr] 918 |     Ok(())
[INFO] [stderr]     |     ^^^^^^ unreachable expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method `begin_scope_with` is never used
[INFO] [stderr]   --> src/lib.rs:71:8
[INFO] [stderr]    |
[INFO] [stderr] 20 | impl TCContext {
[INFO] [stderr]    | -------------- method in this implementation
[INFO] [stderr] ...
[INFO] [stderr] 71 |     fn begin_scope_with(mut self, elem: ContextElement) -> Self {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field `ty_scope` is never read
[INFO] [stderr]    --> src/resolve_names.rs:128:9
[INFO] [stderr]     |
[INFO] [stderr] 124 |     struct VarContext {
[INFO] [stderr]     |            ---------- field in this struct
[INFO] [stderr] ...
[INFO] [stderr] 128 |         ty_scope: usize,
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `type_checker` (lib test) generated 37 warnings (34 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/type_checker-02ffa7e3dc65d967)
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test basic ... ok
[INFO] [stdout] test application ... ok
[INFO] [stdout] test idunit ... ok
[INFO] [stdout] test lambda ... ok
[INFO] [stdout] test nested_to_string ... ok
[INFO] [stdout] test let_with_fun ... ok
[INFO] [stdout] test tuples ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- tuples stdout ----
[INFO] [stdout] - synthesizing Type for (((\0 -> Option::new(48)): (F[Int, ..] -> Option[Int, ])) Option::new(23),let 2 = ((\1 -> 1): (∀1. ('1 -> '1))) in 2 ()) under context []
[INFO] [stdout] -- synthesizing Type for ((\0 -> Option::new(48)): (F[Int, ..] -> Option[Int, ])) Option::new(23) under context []
[INFO] [stdout]                  ->E
[INFO] [stdout] --- synthesizing Type for ((\0 -> Option::new(48)): (F[Int, ..] -> Option[Int, ])) under context []
[INFO] [stdout]                 Anno
[INFO] [stdout] ---- checking that (\0 -> Option::new(48)) has type (F[Int, ..] -> Option[Int, ]) under context []
[INFO] [stdout]                  ->I
[INFO] [stdout] ----- checking that Option::new(48) has type Option[Int, ] under context [0: F[Int, ..]]
[INFO] [stdout]                  Sub
[INFO] [stdout] ------ synthesizing Type for Option::new(48) under context [0: F[Int, ..]]
[INFO] [stdout]                 Cons
[INFO] [stdout] ------- synthesizing Type for 48 under context [0: F[Int, ..]]
[INFO] [stdout] ------ synthesized type 48
[INFO] [stdout] ----- synthesized type Option::new(48)
[INFO] [stdout] ------ have Option[Int, ] be a subtype of Option[Int, ] under Context [0: F[Int, ..]]
[INFO] [stdout]                 <:HK
[INFO] [stdout] ------- have Int be a subtype of Int under Context [0: F[Int, ..]]
[INFO] [stdout] ------- checked context [0: F[Int, ..]]
[INFO] [stdout] ------ checked context [0: F[Int, ..]]
[INFO] [stdout] ----- checked context [0: F[Int, ..]]
[INFO] [stdout] --- synthesized type (\(0: F[Int, ..]) -> Option::new(48))
[INFO] [stdout] synthesizing type if (F[Int, ..] -> Option[Int, ]) is applied to Option::new(23) under Context []
[INFO] [stdout]                ->App
[INFO] [stdout] ---- checking that Option::new(23) has type F[Int, ..] under context []
[INFO] [stdout]                  Sub
[INFO] [stdout] ----- synthesizing Type for Option::new(23) under context []
[INFO] [stdout]                 Cons
[INFO] [stdout] ------ synthesizing Type for 23 under context []
[INFO] [stdout] ----- synthesized type 23
[INFO] [stdout] ---- synthesized type Option::new(23)
[INFO] [stdout] ----- have Option[Int, ] be a subtype of F[Int, ..] under Context []
[INFO] [stdout]                 <:HK
[INFO] [stdout] ------ have Int be a subtype of Int under Context []
[INFO] [stdout] ------ checked context []
[INFO] [stdout] ----- checked context []
[INFO] [stdout] ---- checked context []
[INFO] [stdout] synthesized type as Option::new(23)
[INFO] [stdout] -- synthesized type (\(0: F[Int, ..]) -> Option::new(48)) Option::new(23)
[INFO] [stdout] --- synthesizing Type for let 2 = ((\1 -> 1): (∀1. ('1 -> '1))) in 2 () under context []
[INFO] [stdout]                =>Let
[INFO] [stdout] ---- synthesizing Type for ((\1 -> 1): (∀1. ('1 -> '1))) under context []
[INFO] [stdout]                 Anno
[INFO] [stdout] ----- checking that (\1 -> 1) has type (∀1. ('1 -> '1)) under context []
[INFO] [stdout]                   ∀I
[INFO] [stdout] ------ checking that (\1 -> 1) has type ('1 -> '1) under context [1]
[INFO] [stdout]                  ->I
[INFO] [stdout] ------- checking that 1 has type '1 under context [1, 1: '1]
[INFO] [stdout]                  Sub
[INFO] [stdout] -------- synthesizing Type for 1 under context [1, 1: '1]
[INFO] [stdout]                  Var
[INFO] [stdout] ------- synthesized type (1: '1)
[INFO] [stdout] -------- have '1 be a subtype of '1 under Context [1, 1: '1]
[INFO] [stdout]                <:Var
[INFO] [stdout] -------- checked context [1, 1: '1]
[INFO] [stdout] ------- checked context [1, 1: '1]
[INFO] [stdout] ----- synthesized type (\(1: '1) -> (1: '1))
[INFO] [stdout] ------ synthesizing Type for 2 () under context [2: (∀1. ('1 -> '1))]
[INFO] [stdout]                  ->E
[INFO] [stdout] ------- synthesizing Type for 2 under context [2: (∀1. ('1 -> '1))]
[INFO] [stdout]                  Var
[INFO] [stdout] ------ synthesized type (2: (∀1. ('1 -> '1)))
[INFO] [stdout] synthesizing type if (∀1. ('1 -> '1)) is applied to () under Context [2: (∀1. ('1 -> '1))]
[INFO] [stdout]                 ∀App
[INFO] [stdout] synthesizing type if ('1 -> '1) is applied to () under Context [2: (∀1. ('1 -> '1)), '1]
[INFO] [stdout]                ->App
[INFO] [stdout] ------- checking that () has type '1 under context [2: (∀1. ('1 -> '1)), '1]
[INFO] [stdout]                  Sub
[INFO] [stdout] -------- synthesizing Type for () under context [2: (∀1. ('1 -> '1)), '1]
[INFO] [stdout]                 1I=>
[INFO] [stdout] ------- synthesized type ()
[INFO] [stdout] ------- looking for 1 in [2: (∀1. ('1 -> '1)), '1]
[INFO] [stdout] -------- have () be a subtype of '1 under Context [2: (∀1. ('1 -> '1)), '1]
[INFO] [stdout] --------- instantiate 1 to a subtype of () under Context [2: (∀1. ('1 -> '1)), '1]
[INFO] [stdout]           InstLSolve
[INFO] [stdout] --------- checked context [2: (∀1. ('1 -> '1)), '1: ()]
[INFO] [stdout] -------- checked context [2: (∀1. ('1 -> '1)), '1: ()]
[INFO] [stdout] synthesized type as ()
[INFO] [stdout] synthesized type as ()
[INFO] [stdout] ------ synthesized type (2: (∀1. ('1 -> '1))) ()
[INFO] [stdout] ----- synthesized type let (2: (∀1. ('1 -> '1))) = (\(1: '1) -> (1: '1)) in (2: (∀1. ('1 -> '1))) ()
[INFO] [stdout] ---- synthesized type ((\(0: F[Int, ..]) -> Option::new(48)) Option::new(23),let (2: (∀1. ('1 -> '1))) = (\(1: '1) -> (1: '1)) in (2: (∀1. ('1 -> '1))) ())
[INFO] [stdout] ---- looking for 1 in [2: (∀1. ('1 -> '1)), '1: ()]
[INFO] [stdout] 
[INFO] [stdout] thread 'tuples' (30) panicked at src/lib.rs:917:5:
[INFO] [stdout] explicit panic
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x64fdd85d0132 - std[3f03f8b59f91bef1]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x64fdd85d0132 - std[3f03f8b59f91bef1]::backtrace_rs::backtrace::trace_unsynchronized::<std[3f03f8b59f91bef1]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x64fdd85d0132 - std[3f03f8b59f91bef1]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x64fdd85d0132 - <<std[3f03f8b59f91bef1]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[585f66e14d78f9ba]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x64fdd85e4c2a - <core[585f66e14d78f9ba]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x64fdd85e4c2a - core[585f66e14d78f9ba]::fmt::write
[INFO] [stdout]    6:     0x64fdd85d4f36 - std[3f03f8b59f91bef1]::io::default_write_fmt::<alloc[15e7b27aba85d2e2]::vec::Vec<u8>>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/io/mod.rs:639:11
[INFO] [stdout]    7:     0x64fdd85d4f36 - <alloc[15e7b27aba85d2e2]::vec::Vec<u8> as std[3f03f8b59f91bef1]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/io/mod.rs:1994:13
[INFO] [stdout]    8:     0x64fdd85ae7ef - <std[3f03f8b59f91bef1]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x64fdd85ae7ef - std[3f03f8b59f91bef1]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x64fdd85c8389 - std[3f03f8b59f91bef1]::panicking::default_hook
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:316:9
[INFO] [stdout]   11:     0x64fdd8563dbe - <alloc[15e7b27aba85d2e2]::boxed::Box<dyn for<'a, 'b> core[585f66e14d78f9ba]::ops::function::Fn<(&'a std[3f03f8b59f91bef1]::panic::PanicHookInfo<'b>,), Output = ()> + core[585f66e14d78f9ba]::marker::Sync + core[585f66e14d78f9ba]::marker::Send> as core[585f66e14d78f9ba]::ops::function::Fn<(&std[3f03f8b59f91bef1]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   12:     0x64fdd8563dbe - test[30224e0cb089acd2]::test_main_with_exit_callback::<test[30224e0cb089acd2]::test_main::{closure#0}>::{closure#0}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/test/src/lib.rs:145:21
[INFO] [stdout]   13:     0x64fdd85c8542 - <alloc[15e7b27aba85d2e2]::boxed::Box<dyn for<'a, 'b> core[585f66e14d78f9ba]::ops::function::Fn<(&'a std[3f03f8b59f91bef1]::panic::PanicHookInfo<'b>,), Output = ()> + core[585f66e14d78f9ba]::marker::Sync + core[585f66e14d78f9ba]::marker::Send> as core[585f66e14d78f9ba]::ops::function::Fn<(&std[3f03f8b59f91bef1]::panic::PanicHookInfo,)>>::call
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/alloc/src/boxed.rs:2220:9
[INFO] [stdout]   14:     0x64fdd85c8542 - std[3f03f8b59f91bef1]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:833:13
[INFO] [stdout]   15:     0x64fdd85ae8da - std[3f03f8b59f91bef1]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:691:13
[INFO] [stdout]   16:     0x64fdd85a3a99 - std[3f03f8b59f91bef1]::sys::backtrace::__rust_end_short_backtrace::<std[3f03f8b59f91bef1]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   17:     0x64fdd85af6fd - __rustc[caa99d26c7bae192]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:689:5
[INFO] [stdout]   18:     0x64fdd85e52fc - core[585f66e14d78f9ba]::panicking::panic_fmt
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/core/src/panicking.rs:80:14
[INFO] [stdout]   19:     0x64fdd85e52c2 - core[585f66e14d78f9ba]::panicking::panic
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/core/src/panicking.rs:150:5
[INFO] [stdout]   20:     0x64fdd8525130 - type_checker[233eb29b6f16651d]::tuples
[INFO] [stdout]                                at /opt/rustwide/workdir/src/lib.rs:917:5
[INFO] [stdout]   21:     0x64fdd850f833 - type_checker[233eb29b6f16651d]::tuples::{closure#0}
[INFO] [stdout]                                at /opt/rustwide/workdir/src/lib.rs:875:16
[INFO] [stdout]   22:     0x64fdd85459d6 - <type_checker[233eb29b6f16651d]::tuples::{closure#0} as core[585f66e14d78f9ba]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   23:     0x64fdd855816b - <fn() -> core[585f66e14d78f9ba]::result::Result<(), alloc[15e7b27aba85d2e2]::string::String> as core[585f66e14d78f9ba]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   24:     0x64fdd855816b - test[30224e0cb089acd2]::__rust_begin_short_backtrace::<core[585f66e14d78f9ba]::result::Result<(), alloc[15e7b27aba85d2e2]::string::String>, fn() -> core[585f66e14d78f9ba]::result::Result<(), alloc[15e7b27aba85d2e2]::string::String>>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/test/src/lib.rs:663:18
[INFO] [stdout]   25:     0x64fdd85649ca - test[30224e0cb089acd2]::run_test_in_process::{closure#0}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/test/src/lib.rs:686:74
[INFO] [stdout]   26:     0x64fdd85649ca - <core[585f66e14d78f9ba]::panic::unwind_safe::AssertUnwindSafe<test[30224e0cb089acd2]::run_test_in_process::{closure#0}> as core[585f66e14d78f9ba]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   27:     0x64fdd85649ca - std[3f03f8b59f91bef1]::panicking::catch_unwind::do_call::<core[585f66e14d78f9ba]::panic::unwind_safe::AssertUnwindSafe<test[30224e0cb089acd2]::run_test_in_process::{closure#0}>, core[585f66e14d78f9ba]::result::Result<(), alloc[15e7b27aba85d2e2]::string::String>>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:581:40
[INFO] [stdout]   28:     0x64fdd85649ca - std[3f03f8b59f91bef1]::panicking::catch_unwind::<core[585f66e14d78f9ba]::result::Result<(), alloc[15e7b27aba85d2e2]::string::String>, core[585f66e14d78f9ba]::panic::unwind_safe::AssertUnwindSafe<test[30224e0cb089acd2]::run_test_in_process::{closure#0}>>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:544:19
[INFO] [stdout]   29:     0x64fdd85649ca - std[3f03f8b59f91bef1]::panic::catch_unwind::<core[585f66e14d78f9ba]::panic::unwind_safe::AssertUnwindSafe<test[30224e0cb089acd2]::run_test_in_process::{closure#0}>, core[585f66e14d78f9ba]::result::Result<(), alloc[15e7b27aba85d2e2]::string::String>>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panic.rs:359:14
[INFO] [stdout]   30:     0x64fdd85649ca - test[30224e0cb089acd2]::run_test_in_process
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/test/src/lib.rs:686:27
[INFO] [stdout]   31:     0x64fdd85649ca - test[30224e0cb089acd2]::run_test::{closure#0}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/test/src/lib.rs:607:43
[INFO] [stdout]   32:     0x64fdd855ee94 - test[30224e0cb089acd2]::run_test::{closure#1}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/test/src/lib.rs:637:41
[INFO] [stdout]   33:     0x64fdd855ee94 - std[3f03f8b59f91bef1]::sys::backtrace::__rust_begin_short_backtrace::<test[30224e0cb089acd2]::run_test::{closure#1}, ()>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/sys/backtrace.rs:166:18
[INFO] [stdout]   34:     0x64fdd85674c2 - std[3f03f8b59f91bef1]::thread::lifecycle::spawn_unchecked::<test[30224e0cb089acd2]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/thread/lifecycle.rs:91:13
[INFO] [stdout]   35:     0x64fdd85674c2 - <core[585f66e14d78f9ba]::panic::unwind_safe::AssertUnwindSafe<std[3f03f8b59f91bef1]::thread::lifecycle::spawn_unchecked<test[30224e0cb089acd2]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}> as core[585f66e14d78f9ba]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/core/src/panic/unwind_safe.rs:274:9
[INFO] [stdout]   36:     0x64fdd85674c2 - std[3f03f8b59f91bef1]::panicking::catch_unwind::do_call::<core[585f66e14d78f9ba]::panic::unwind_safe::AssertUnwindSafe<std[3f03f8b59f91bef1]::thread::lifecycle::spawn_unchecked<test[30224e0cb089acd2]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:581:40
[INFO] [stdout]   37:     0x64fdd85674c2 - std[3f03f8b59f91bef1]::panicking::catch_unwind::<(), core[585f66e14d78f9ba]::panic::unwind_safe::AssertUnwindSafe<std[3f03f8b59f91bef1]::thread::lifecycle::spawn_unchecked<test[30224e0cb089acd2]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panicking.rs:544:19
[INFO] [stdout]   38:     0x64fdd85674c2 - std[3f03f8b59f91bef1]::panic::catch_unwind::<core[585f66e14d78f9ba]::panic::unwind_safe::AssertUnwindSafe<std[3f03f8b59f91bef1]::thread::lifecycle::spawn_unchecked<test[30224e0cb089acd2]::run_test::{closure#1}, ()>::{closure#1}::{closure#0}>, ()>
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/panic.rs:359:14
[INFO] [stdout]   39:     0x64fdd85674c2 - std[3f03f8b59f91bef1]::thread::lifecycle::spawn_unchecked::<test[30224e0cb089acd2]::run_test::{closure#1}, ()>::{closure#1}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/thread/lifecycle.rs:89:26
[INFO] [stdout]   40:     0x64fdd85674c2 - <std[3f03f8b59f91bef1]::thread::lifecycle::spawn_unchecked<test[30224e0cb089acd2]::run_test::{closure#1}, ()>::{closure#1} as core[585f66e14d78f9ba]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/core/src/ops/function.rs:250:5
[INFO] [stdout]   41:     0x64fdd85cf9df - <alloc[15e7b27aba85d2e2]::boxed::Box<dyn core[585f66e14d78f9ba]::ops::function::FnOnce<(), Output = ()> + core[585f66e14d78f9ba]::marker::Send> as core[585f66e14d78f9ba]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/alloc/src/boxed.rs:2206:9
[INFO] [stdout]   42:     0x64fdd85cf9df - <std[3f03f8b59f91bef1]::sys::thread::unix::Thread>::new::thread_start
[INFO] [stdout]                                at /rustc/db823df02fd0c2cf67b43025ac3fef3f2d743245/library/std/src/sys/thread/unix.rs:119:17
[INFO] [stdout]   43:     0x72e2d2056aa4 - <unknown>
[INFO] [stdout]   44:     0x72e2d20e3a64 - clone
[INFO] [stdout]   45:                0x0 - <unknown>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     tuples
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 6 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.06s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass `--lib`
[INFO] running `Command { std: "docker" "inspect" "9c2e57b4cd3f43b11df0ca79b8e7e909d6bd859c9e8d3494b02b5c2520f3f759", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c2e57b4cd3f43b11df0ca79b8e7e909d6bd859c9e8d3494b02b5c2520f3f759", kill_on_drop: false }`
[INFO] [stdout] 9c2e57b4cd3f43b11df0ca79b8e7e909d6bd859c9e8d3494b02b5c2520f3f759
