[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] 7f2c6857a07c9b2082efaa93d0535bd756e4609e
[INFO] checking neverRare/butter against try#39e1293fce4b650061e85dda88aa428f726a8444 for pr-88041
[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 39e1293fce4b650061e85dda88aa428f726a8444
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+39e1293fce4b650061e85dda88aa428f726a8444" "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" "+39e1293fce4b650061e85dda88aa428f726a8444" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+39e1293fce4b650061e85dda88aa428f726a8444" "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] 18f35fc0f32b8e582775897c9fa7c8b9d063b31fd3929f89adcc7c6c8ff9c0d1
[INFO] running `Command { std: "docker" "start" "-a" "18f35fc0f32b8e582775897c9fa7c8b9d063b31fd3929f89adcc7c6c8ff9c0d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18f35fc0f32b8e582775897c9fa7c8b9d063b31fd3929f89adcc7c6c8ff9c0d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18f35fc0f32b8e582775897c9fa7c8b9d063b31fd3929f89adcc7c6c8ff9c0d1", kill_on_drop: false }`
[INFO] [stdout] 18f35fc0f32b8e582775897c9fa7c8b9d063b31fd3929f89adcc7c6c8ff9c0d1
[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" "+39e1293fce4b650061e85dda88aa428f726a8444" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 31867bb640b2278259e319081afca666f8e4bea935ad728a6f359dd398405812
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "31867bb640b2278259e319081afca666f8e4bea935ad728a6f359dd398405812", kill_on_drop: false }`
[INFO] [stderr]     Checking hir v0.1.0 (/opt/rustwide/workdir/hir)
[INFO] [stderr]     Checking memchr v2.4.0
[INFO] [stderr]     Checking type-system v0.1.0 (/opt/rustwide/workdir/type-system)
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> type-system/src/lib.rs:152:14
[INFO] [stdout]     |
[INFO] [stdout] 152 | pub fn infer(statements: Vec<Statement<()>>) -> Result<Vec<Statement<Type>>, TypeError> {
[INFO] [stdout]     |              ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> type-system/src/lib.rs:152:14
[INFO] [stdout]     |
[INFO] [stdout] 152 | pub fn infer(statements: Vec<Statement<()>>) -> Result<Vec<Statement<Type>>, TypeError> {
[INFO] [stdout]     |              ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[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:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub 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:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub 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/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: `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/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:24:12
[INFO] [stdout]    |
[INFO] [stdout] 24 |     pub 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:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub 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: associated function is never used: `substitute`
[INFO] [stdout]   --> type-system/src/ty.rs:61:19
[INFO] [stdout]    |
[INFO] [stdout] 61 |     pub(super) fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[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:61:19
[INFO] [stdout]    |
[INFO] [stdout] 61 |     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.rs:75:19
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub(super) fn unify_with(
[INFO] [stdout]    |                   ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]   --> type-system/src/ty.rs:75:19
[INFO] [stdout]    |
[INFO] [stdout] 75 |     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.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.rs:118:8
[INFO] [stdout]     |
[INFO] [stdout] 118 |     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: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: `unify_with`
[INFO] [stdout]    --> type-system/src/ty.rs:129:8
[INFO] [stdout]     |
[INFO] [stdout] 129 |     fn unify_with(self, other: Self) -> Result<Subs<'a>, TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:118:8
[INFO] [stdout]     |
[INFO] [stdout] 118 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `kind`
[INFO] [stdout]    --> type-system/src/ty.rs:164:8
[INFO] [stdout]     |
[INFO] [stdout] 164 |     fn kind(&self) -> Kind {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `unify_with`
[INFO] [stdout]    --> type-system/src/ty.rs:129:8
[INFO] [stdout]     |
[INFO] [stdout] 129 |     fn unify_with(self, other: Self) -> 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:170:8
[INFO] [stdout]     |
[INFO] [stdout] 170 |     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:176:8
[INFO] [stdout]     |
[INFO] [stdout] 176 |     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:189:8
[INFO] [stdout]     |
[INFO] [stdout] 189 |     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:196:8
[INFO] [stdout]     |
[INFO] [stdout] 196 |     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:202:12
[INFO] [stdout]     |
[INFO] [stdout] 202 |     pub 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:225:12
[INFO] [stdout]     |
[INFO] [stdout] 225 |     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:228:8
[INFO] [stdout]     |
[INFO] [stdout] 228 |     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:232:8
[INFO] [stdout]     |
[INFO] [stdout] 232 |     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:236:8
[INFO] [stdout]     |
[INFO] [stdout] 236 |     fn into_hashmap(self) -> HashMap<Var<'a>, Type1<'a>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `kind`
[INFO] [stdout]    --> type-system/src/ty.rs:164:8
[INFO] [stdout]     |
[INFO] [stdout] 164 |     fn kind(&self) -> Kind {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get`
[INFO] [stdout]    --> type-system/src/ty.rs:240:8
[INFO] [stdout]     |
[INFO] [stdout] 240 |     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:243:8
[INFO] [stdout]     |
[INFO] [stdout] 243 |     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:246:8
[INFO] [stdout]     |
[INFO] [stdout] 246 |     fn filter_off(&mut self, vars: &HashSet<KindedVar<'a>>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:170:8
[INFO] [stdout]     |
[INFO] [stdout] 170 |     fn free_vars(&self) -> 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:251:12
[INFO] [stdout]     |
[INFO] [stdout] 251 |     pub fn compose_with(&mut self, other: Self) -> Result<(), TypeError> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `substitute`
[INFO] [stdout]    --> type-system/src/ty.rs:176:8
[INFO] [stdout]     |
[INFO] [stdout] 176 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Env`
[INFO] [stdout]    --> type-system/src/ty.rs:268:19
[INFO] [stdout]     |
[INFO] [stdout] 268 | pub(super) struct Env<'a>(HashMap<Var<'a>, Scheme<'a>>);
[INFO] [stdout]     |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:189:8
[INFO] [stdout]     |
[INFO] [stdout] 189 |     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:196:8
[INFO] [stdout]     |
[INFO] [stdout] 196 |     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:202:12
[INFO] [stdout]     |
[INFO] [stdout] 202 |     pub 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:225:12
[INFO] [stdout]     |
[INFO] [stdout] 225 |     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:228:8
[INFO] [stdout]     |
[INFO] [stdout] 228 |     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:232:8
[INFO] [stdout]     |
[INFO] [stdout] 232 |     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:236:8
[INFO] [stdout]     |
[INFO] [stdout] 236 |     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:240:8
[INFO] [stdout]     |
[INFO] [stdout] 240 |     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:243:8
[INFO] [stdout]     |
[INFO] [stdout] 243 |     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:246:8
[INFO] [stdout]     |
[INFO] [stdout] 246 |     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:251:12
[INFO] [stdout]     |
[INFO] [stdout] 251 |     pub fn compose_with(&mut self, other: Self) -> Result<(), TypeError> {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap`
[INFO] [stdout]    --> type-system/src/ty.rs:270:8
[INFO] [stdout]     |
[INFO] [stdout] 270 |     fn hashmap(&self) -> &HashMap<Var<'a>, Scheme<'a>> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Env`
[INFO] [stdout]    --> type-system/src/ty.rs:268:19
[INFO] [stdout]     |
[INFO] [stdout] 268 | 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:270:8
[INFO] [stdout]     |
[INFO] [stdout] 270 |     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:274:8
[INFO] [stdout]     |
[INFO] [stdout] 274 |     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: `get`
[INFO] [stdout]    --> type-system/src/ty.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |     pub fn get(&self, var: Var<'a>) -> Option<Scheme<'a>> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]    --> type-system/src/ty.rs:281:8
[INFO] [stdout]     |
[INFO] [stdout] 281 |     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:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 |     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:290:8
[INFO] [stdout]     |
[INFO] [stdout] 290 |     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:296:8
[INFO] [stdout]     |
[INFO] [stdout] 296 |     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>(literal: Literal) -> Type<'a> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `infer_expr`
[INFO] [stdout]   --> type-system/src/lib.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn infer_expr<'a>(
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking combine v4.6.0
[INFO] [stdout] warning: associated function is never used: `hashmap_mut`
[INFO] [stdout]    --> type-system/src/ty.rs:274:8
[INFO] [stdout]     |
[INFO] [stdout] 274 |     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: `get`
[INFO] [stdout]    --> type-system/src/ty.rs:278:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |     pub fn get(&self, var: Var<'a>) -> Option<Scheme<'a>> {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]    --> type-system/src/ty.rs:281:8
[INFO] [stdout]     |
[INFO] [stdout] 281 |     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:284:8
[INFO] [stdout]     |
[INFO] [stdout] 284 |     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:290:8
[INFO] [stdout]     |
[INFO] [stdout] 290 |     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:296:8
[INFO] [stdout]     |
[INFO] [stdout] 296 |     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>(literal: Literal) -> Type<'a> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `infer_expr`
[INFO] [stdout]   --> type-system/src/lib.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn infer_expr<'a>(
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 44 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 44 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking parser v0.1.0 (/opt/rustwide/workdir/parser)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.46s
[INFO] running `Command { std: "docker" "inspect" "31867bb640b2278259e319081afca666f8e4bea935ad728a6f359dd398405812", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31867bb640b2278259e319081afca666f8e4bea935ad728a6f359dd398405812", kill_on_drop: false }`
[INFO] [stdout] 31867bb640b2278259e319081afca666f8e4bea935ad728a6f359dd398405812