[INFO] cloning repository https://github.com/neverRare/butter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/neverRare/butter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FneverRare%2Fbutter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FneverRare%2Fbutter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b33adecbd1aaa7ec33699dcb87610ea01e8c66df
[INFO] checking neverRare/butter against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FneverRare%2Fbutter" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/neverRare/butter on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/neverRare/butter
[INFO] finished tweaking git repo https://github.com/neverRare/butter
[INFO] tweaked toml for git repo https://github.com/neverRare/butter written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/neverRare/butter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded combine v4.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dc03338ffb2229af21ce67a8e5f41a180bf4f5cd5550feb74b56a3e3411d71f8
[INFO] running `Command { std: "docker" "start" "-a" "dc03338ffb2229af21ce67a8e5f41a180bf4f5cd5550feb74b56a3e3411d71f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc03338ffb2229af21ce67a8e5f41a180bf4f5cd5550feb74b56a3e3411d71f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc03338ffb2229af21ce67a8e5f41a180bf4f5cd5550feb74b56a3e3411d71f8", kill_on_drop: false }`
[INFO] [stdout] dc03338ffb2229af21ce67a8e5f41a180bf4f5cd5550feb74b56a3e3411d71f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9f21317c260ec7bc10502589e44d4f81b931a7951331d8d253d29a8fbd3ac68b
[INFO] running `Command { std: "docker" "start" "-a" "9f21317c260ec7bc10502589e44d4f81b931a7951331d8d253d29a8fbd3ac68b", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]     Checking hir v0.1.0 (/opt/rustwide/workdir/hir)
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking type-system v0.1.0 (/opt/rustwide/workdir/type-system)
[INFO] [stdout] warning: usage of an `unsafe` block
[INFO] [stdout]   --> type-system/src/lib.rs:51:23
[INFO] [stdout]    |
[INFO] [stdout] 51 |                 expr: unsafe { transmute(expr) },
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> type-system/src/lib.rs:3:9
[INFO] [stdout]    |
[INFO] [stdout] 3  | #![warn(unsafe_code)]
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: usage of an `unsafe` block
[INFO] [stdout]   --> type-system/src/lib.rs:51:23
[INFO] [stdout]    |
[INFO] [stdout] 51 |                 expr: unsafe { transmute(expr) },
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> type-system/src/lib.rs:3:9
[INFO] [stdout]    |
[INFO] [stdout] 3  | #![warn(unsafe_code)]
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var_state`
[INFO] [stdout]   --> type-system/src/lib.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 |     var_state: &mut VarState<'a>,
[INFO] [stdout]    |     ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_var_state`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `env`
[INFO] [stdout]   --> type-system/src/lib.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     env: &Env<'a>,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_env`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]   --> type-system/src/lib.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     statements: Vec<Statement<'a, NoType<'a>>>,
[INFO] [stdout]    |     ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]   --> type-system/src/ty/cons.rs:32:19
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub(super) fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]    |                   ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]   --> type-system/src/ty/cons.rs:49:19
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub(super) fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]    |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]   --> type-system/src/ty/cons.rs:72:19
[INFO] [stdout]    |
[INFO] [stdout] 72 |     pub(super) fn unify_with(
[INFO] [stdout]    |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty/cons.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty/cons.rs:118:8
[INFO] [stdout]     |
[INFO] [stdout] 118 |     fn substitute(
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]    --> type-system/src/ty/cons.rs:151:19
[INFO] [stdout]     |
[INFO] [stdout] 151 |     pub(super) fn unify_with(
[INFO] [stdout]     |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `intersection`
[INFO] [stdout]    --> type-system/src/ty/cons.rs:202:4
[INFO] [stdout]     |
[INFO] [stdout] 202 | fn intersection<K, A, B>(a: &mut HashMap<K, A>, b: &mut HashMap<K, B>) -> HashMap<K, (A, B)>
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> type-system/src/ty.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_var`
[INFO] [stdout]   --> type-system/src/ty.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn new_var(&mut self) -> Var<'a> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_named`
[INFO] [stdout]   --> type-system/src/ty.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn new_named(&mut self, name: &'a str) -> Var<'a> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Type`
[INFO] [stdout]   --> type-system/src/ty.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     Type,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `MutType`
[INFO] [stdout]   --> type-system/src/ty.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     MutType,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]   --> type-system/src/ty.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]   --> type-system/src/ty.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]   --> type-system/src/ty.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn unify_with(self, other: Self, var_state: &mut VarState<'a>) -> Result<Subs<'a>, TypeError> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:114:8
[INFO] [stdout]     |
[INFO] [stdout] 114 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]    --> type-system/src/ty.rs:125:8
[INFO] [stdout]     |
[INFO] [stdout] 125 |     fn unify_with(self, other: Self) -> Result<Subs<'a>, TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `kind`
[INFO] [stdout]    --> type-system/src/ty.rs:160:8
[INFO] [stdout]     |
[INFO] [stdout] 160 |     fn kind(&self) -> Kind {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:185:8
[INFO] [stdout]     |
[INFO] [stdout] 185 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:192:8
[INFO] [stdout]     |
[INFO] [stdout] 192 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `instantiate`
[INFO] [stdout]    --> type-system/src/ty.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 198 |     fn instantiate(self, var_state: &mut VarState<'a>) -> Result<Type<'a>, TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> type-system/src/ty.rs:221:12
[INFO] [stdout]     |
[INFO] [stdout] 221 |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap`
[INFO] [stdout]    --> type-system/src/ty.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 |     fn hashmap(&self) -> &HashMap<Var<'a>, Type1<'a>> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap_mut`
[INFO] [stdout]    --> type-system/src/ty.rs:228:8
[INFO] [stdout]     |
[INFO] [stdout] 228 |     fn hashmap_mut(&mut self) -> &mut HashMap<Var<'a>, Type1<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_hashmap`
[INFO] [stdout]    --> type-system/src/ty.rs:232:8
[INFO] [stdout]     |
[INFO] [stdout] 232 |     fn into_hashmap(self) -> HashMap<Var<'a>, Type1<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get`
[INFO] [stdout]    --> type-system/src/ty.rs:236:8
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn get(&self, var: Var<'a>) -> Option<Type1<'a>> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]    --> type-system/src/ty.rs:239:8
[INFO] [stdout]     |
[INFO] [stdout] 239 |     fn insert(&mut self, var: Var<'a>, ty: Type1<'a>) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `filter_off`
[INFO] [stdout]    --> type-system/src/ty.rs:242:8
[INFO] [stdout]     |
[INFO] [stdout] 242 |     fn filter_off(&mut self, vars: &HashSet<KindedVar<'a>>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `compose_with`
[INFO] [stdout]    --> type-system/src/ty.rs:247:8
[INFO] [stdout]     |
[INFO] [stdout] 247 |     fn compose_with(&mut self, other: Self) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Env`
[INFO] [stdout]    --> type-system/src/ty.rs:264:19
[INFO] [stdout]     |
[INFO] [stdout] 264 | pub(super) struct Env<'a>(HashMap<Var<'a>, Scheme<'a>>);
[INFO] [stdout]     |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap`
[INFO] [stdout]    --> type-system/src/ty.rs:266:8
[INFO] [stdout]     |
[INFO] [stdout] 266 |     fn hashmap(&self) -> &HashMap<Var<'a>, Scheme<'a>> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap_mut`
[INFO] [stdout]    --> type-system/src/ty.rs:270:8
[INFO] [stdout]     |
[INFO] [stdout] 270 |     fn hashmap_mut(&mut self) -> &mut HashMap<Var<'a>, Scheme<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]    --> type-system/src/ty.rs:274:8
[INFO] [stdout]     |
[INFO] [stdout] 274 |     fn remove(&mut self, var: Var<'a>) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:277:8
[INFO] [stdout]     |
[INFO] [stdout] 277 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `generalize`
[INFO] [stdout]    --> type-system/src/ty.rs:289:8
[INFO] [stdout]     |
[INFO] [stdout] 289 |     fn generalize(&self, ty: Type<'a>) -> Scheme<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `TypedExpr`
[INFO] [stdout]   --> type-system/src/lib.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct TypedExpr<'a> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `infer_literal`
[INFO] [stdout]   --> type-system/src/lib.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn infer_literal<'a>(expr: &Expr<'a, NoType<'a>>) -> Option<Type<'a>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `infer_expr`
[INFO] [stdout]   --> type-system/src/lib.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn infer_expr<'a>(
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `var_state`
[INFO] [stdout]   --> type-system/src/lib.rs:43:5
[INFO] [stdout]    |
[INFO] [stdout] 43 |     var_state: &mut VarState<'a>,
[INFO] [stdout]    |     ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_var_state`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 46 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `env`
[INFO] [stdout]   --> type-system/src/lib.rs:44:5
[INFO] [stdout]    |
[INFO] [stdout] 44 |     env: &Env<'a>,
[INFO] [stdout]    |     ^^^ help: if this is intentional, prefix it with an underscore: `_env`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]   --> type-system/src/lib.rs:58:5
[INFO] [stdout]    |
[INFO] [stdout] 58 |     statements: Vec<Statement<'a, NoType<'a>>>,
[INFO] [stdout]    |     ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]   --> type-system/src/ty/cons.rs:32:19
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub(super) fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]    |                   ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]   --> type-system/src/ty/cons.rs:49:19
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub(super) fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]    |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]   --> type-system/src/ty/cons.rs:72:19
[INFO] [stdout]    |
[INFO] [stdout] 72 |     pub(super) fn unify_with(
[INFO] [stdout]    |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty/cons.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty/cons.rs:118:8
[INFO] [stdout]     |
[INFO] [stdout] 118 |     fn substitute(
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]    --> type-system/src/ty/cons.rs:151:19
[INFO] [stdout]     |
[INFO] [stdout] 151 |     pub(super) fn unify_with(
[INFO] [stdout]     |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `intersection`
[INFO] [stdout]    --> type-system/src/ty/cons.rs:202:4
[INFO] [stdout]     |
[INFO] [stdout] 202 | fn intersection<K, A, B>(a: &mut HashMap<K, A>, b: &mut HashMap<K, B>) -> HashMap<K, (A, B)>
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> type-system/src/ty.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_var`
[INFO] [stdout]   --> type-system/src/ty.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn new_var(&mut self) -> Var<'a> {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_named`
[INFO] [stdout]   --> type-system/src/ty.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn new_named(&mut self, name: &'a str) -> Var<'a> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Type`
[INFO] [stdout]   --> type-system/src/ty.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 37 |     Type,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `MutType`
[INFO] [stdout]   --> type-system/src/ty.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     MutType,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]   --> type-system/src/ty.rs:51:8
[INFO] [stdout]    |
[INFO] [stdout] 51 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]   --> type-system/src/ty.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]   --> type-system/src/ty.rs:75:8
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn unify_with(self, other: Self, var_state: &mut VarState<'a>) -> Result<Subs<'a>, TypeError> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:114:8
[INFO] [stdout]     |
[INFO] [stdout] 114 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]    --> type-system/src/ty.rs:125:8
[INFO] [stdout]     |
[INFO] [stdout] 125 |     fn unify_with(self, other: Self) -> Result<Subs<'a>, TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `kind`
[INFO] [stdout]    --> type-system/src/ty.rs:160:8
[INFO] [stdout]     |
[INFO] [stdout] 160 |     fn kind(&self) -> Kind {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:185:8
[INFO] [stdout]     |
[INFO] [stdout] 185 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:192:8
[INFO] [stdout]     |
[INFO] [stdout] 192 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `instantiate`
[INFO] [stdout]    --> type-system/src/ty.rs:198:8
[INFO] [stdout]     |
[INFO] [stdout] 198 |     fn instantiate(self, var_state: &mut VarState<'a>) -> Result<Type<'a>, TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> type-system/src/ty.rs:221:12
[INFO] [stdout]     |
[INFO] [stdout] 221 |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap`
[INFO] [stdout]    --> type-system/src/ty.rs:224:8
[INFO] [stdout]     |
[INFO] [stdout] 224 |     fn hashmap(&self) -> &HashMap<Var<'a>, Type1<'a>> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap_mut`
[INFO] [stdout]    --> type-system/src/ty.rs:228:8
[INFO] [stdout]     |
[INFO] [stdout] 228 |     fn hashmap_mut(&mut self) -> &mut HashMap<Var<'a>, Type1<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `into_hashmap`
[INFO] [stdout]    --> type-system/src/ty.rs:232:8
[INFO] [stdout]     |
[INFO] [stdout] 232 |     fn into_hashmap(self) -> HashMap<Var<'a>, Type1<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get`
[INFO] [stdout]    --> type-system/src/ty.rs:236:8
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn get(&self, var: Var<'a>) -> Option<Type1<'a>> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]    --> type-system/src/ty.rs:239:8
[INFO] [stdout]     |
[INFO] [stdout] 239 |     fn insert(&mut self, var: Var<'a>, ty: Type1<'a>) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `filter_off`
[INFO] [stdout]    --> type-system/src/ty.rs:242:8
[INFO] [stdout]     |
[INFO] [stdout] 242 |     fn filter_off(&mut self, vars: &HashSet<KindedVar<'a>>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `compose_with`
[INFO] [stdout]    --> type-system/src/ty.rs:247:8
[INFO] [stdout]     |
[INFO] [stdout] 247 |     fn compose_with(&mut self, other: Self) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Env`
[INFO] [stdout]    --> type-system/src/ty.rs:264:19
[INFO] [stdout]     |
[INFO] [stdout] 264 | pub(super) struct Env<'a>(HashMap<Var<'a>, Scheme<'a>>);
[INFO] [stdout]     |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap`
[INFO] [stdout]    --> type-system/src/ty.rs:266:8
[INFO] [stdout]     |
[INFO] [stdout] 266 |     fn hashmap(&self) -> &HashMap<Var<'a>, Scheme<'a>> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap_mut`
[INFO] [stdout]    --> type-system/src/ty.rs:270:8
[INFO] [stdout]     |
[INFO] [stdout] 270 |     fn hashmap_mut(&mut self) -> &mut HashMap<Var<'a>, Scheme<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]    --> type-system/src/ty.rs:274:8
[INFO] [stdout]     |
[INFO] [stdout] 274 |     fn remove(&mut self, var: Var<'a>) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:277:8
[INFO] [stdout]     |
[INFO] [stdout] 277 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `generalize`
[INFO] [stdout]    --> type-system/src/ty.rs:289:8
[INFO] [stdout]     |
[INFO] [stdout] 289 |     fn generalize(&self, ty: Type<'a>) -> Scheme<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `TypedExpr`
[INFO] [stdout]   --> type-system/src/lib.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 | struct TypedExpr<'a> {
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `infer_literal`
[INFO] [stdout]   --> type-system/src/lib.rs:32:4
[INFO] [stdout]    |
[INFO] [stdout] 32 | fn infer_literal<'a>(expr: &Expr<'a, NoType<'a>>) -> Option<Type<'a>> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `infer_expr`
[INFO] [stdout]   --> type-system/src/lib.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn infer_expr<'a>(
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 46 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking combine v4.6.0
[INFO] [stderr]     Checking parser v0.1.0 (/opt/rustwide/workdir/parser)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.31s
[INFO] running `Command { std: "docker" "inspect" "9f21317c260ec7bc10502589e44d4f81b931a7951331d8d253d29a8fbd3ac68b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f21317c260ec7bc10502589e44d4f81b931a7951331d8d253d29a8fbd3ac68b", kill_on_drop: false }`
[INFO] [stdout] 9f21317c260ec7bc10502589e44d4f81b931a7951331d8d253d29a8fbd3ac68b