[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] f029d3816932ef3a2f87ab2bdf59b237a9972f6d
[INFO] testing neverRare/butter against beta-2021-09-08 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FneverRare%2Fbutter" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/neverRare/butter on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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-2/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" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded combine v4.6.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ad5e978d933f38caa29aa7b88c95c9764e65328d7b4335076dfd5ab14844ea40
[INFO] running `Command { std: "docker" "start" "-a" "ad5e978d933f38caa29aa7b88c95c9764e65328d7b4335076dfd5ab14844ea40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ad5e978d933f38caa29aa7b88c95c9764e65328d7b4335076dfd5ab14844ea40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad5e978d933f38caa29aa7b88c95c9764e65328d7b4335076dfd5ab14844ea40", kill_on_drop: false }`
[INFO] [stdout] ad5e978d933f38caa29aa7b88c95c9764e65328d7b4335076dfd5ab14844ea40
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7bf130e98f881281f465317f9e0acd5180bf8f049562f055668dbdb125f0d699
[INFO] running `Command { std: "docker" "start" "-a" "7bf130e98f881281f465317f9e0acd5180bf8f049562f055668dbdb125f0d699", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling hir v0.1.0 (/opt/rustwide/workdir/hir)
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling type-system v0.1.0 (/opt/rustwide/workdir/type-system)
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> type-system/src/lib.rs:229:14
[INFO] [stdout]     |
[INFO] [stdout] 229 | 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: `kind`
[INFO] [stdout]    --> type-system/src/ty.rs:162:8
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn kind(&self) -> Kind {
[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:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 |     fn free_vars(&self) -> 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:187:8
[INFO] [stdout]     |
[INFO] [stdout] 187 |     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:194:8
[INFO] [stdout]     |
[INFO] [stdout] 194 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `filter_off`
[INFO] [stdout]    --> type-system/src/ty.rs:244:8
[INFO] [stdout]     |
[INFO] [stdout] 244 |     fn filter_off(&mut self, vars: &HashSet<KindedVar<'a>>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap_mut`
[INFO] [stdout]    --> type-system/src/ty.rs:276:8
[INFO] [stdout]     |
[INFO] [stdout] 276 |     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:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 |     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:286:8
[INFO] [stdout]     |
[INFO] [stdout] 286 |     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:292:8
[INFO] [stdout]     |
[INFO] [stdout] 292 |     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:298:8
[INFO] [stdout]     |
[INFO] [stdout] 298 |     fn generalize(&self, ty: Type<'a>) -> Scheme<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling combine v4.6.1
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.16
[INFO] [stderr]    Compiling parser v0.1.0 (/opt/rustwide/workdir/parser)
[INFO] [stderr]    Compiling structopt v0.3.23
[INFO] [stderr]    Compiling butter v0.1.0 (/opt/rustwide/workdir/cli)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 33.58s
[INFO] running `Command { std: "docker" "inspect" "7bf130e98f881281f465317f9e0acd5180bf8f049562f055668dbdb125f0d699", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7bf130e98f881281f465317f9e0acd5180bf8f049562f055668dbdb125f0d699", kill_on_drop: false }`
[INFO] [stdout] 7bf130e98f881281f465317f9e0acd5180bf8f049562f055668dbdb125f0d699
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d48c045f3357c652f2934a5627610ecbd640a0859d7a4440165719535427deb0
[INFO] running `Command { std: "docker" "start" "-a" "d48c045f3357c652f2934a5627610ecbd640a0859d7a4440165719535427deb0", kill_on_drop: false }`
[INFO] [stderr]    Compiling hir v0.1.0 (/opt/rustwide/workdir/hir)
[INFO] [stderr]    Compiling type-system v0.1.0 (/opt/rustwide/workdir/type-system)
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> type-system/src/lib.rs:229:14
[INFO] [stdout]     |
[INFO] [stdout] 229 | 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] [stderr]    Compiling parser v0.1.0 (/opt/rustwide/workdir/parser)
[INFO] [stdout] warning: associated function is never used: `kind`
[INFO] [stdout]    --> type-system/src/ty.rs:162:8
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn kind(&self) -> Kind {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling butter v0.1.0 (/opt/rustwide/workdir/cli)
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/ty.rs:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 |     fn free_vars(&self) -> 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:187:8
[INFO] [stdout]     |
[INFO] [stdout] 187 |     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:194:8
[INFO] [stdout]     |
[INFO] [stdout] 194 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `filter_off`
[INFO] [stdout]    --> type-system/src/ty.rs:244:8
[INFO] [stdout]     |
[INFO] [stdout] 244 |     fn filter_off(&mut self, vars: &HashSet<KindedVar<'a>>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap_mut`
[INFO] [stdout]    --> type-system/src/ty.rs:276:8
[INFO] [stdout]     |
[INFO] [stdout] 276 |     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:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 |     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:286:8
[INFO] [stdout]     |
[INFO] [stdout] 286 |     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:292:8
[INFO] [stdout]     |
[INFO] [stdout] 292 |     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:298:8
[INFO] [stdout]     |
[INFO] [stdout] 298 |     fn generalize(&self, ty: Type<'a>) -> Scheme<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> type-system/src/lib.rs:229:14
[INFO] [stdout]     |
[INFO] [stdout] 229 | 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: `kind`
[INFO] [stdout]    --> type-system/src/ty.rs:162:8
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn kind(&self) -> Kind {
[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:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 |     fn free_vars(&self) -> 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:187:8
[INFO] [stdout]     |
[INFO] [stdout] 187 |     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:194:8
[INFO] [stdout]     |
[INFO] [stdout] 194 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `filter_off`
[INFO] [stdout]    --> type-system/src/ty.rs:244:8
[INFO] [stdout]     |
[INFO] [stdout] 244 |     fn filter_off(&mut self, vars: &HashSet<KindedVar<'a>>) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap_mut`
[INFO] [stdout]    --> type-system/src/ty.rs:276:8
[INFO] [stdout]     |
[INFO] [stdout] 276 |     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:283:8
[INFO] [stdout]     |
[INFO] [stdout] 283 |     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:286:8
[INFO] [stdout]     |
[INFO] [stdout] 286 |     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:292:8
[INFO] [stdout]     |
[INFO] [stdout] 292 |     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:298:8
[INFO] [stdout]     |
[INFO] [stdout] 298 |     fn generalize(&self, ty: Type<'a>) -> Scheme<'a> {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 18.01s
[INFO] running `Command { std: "docker" "inspect" "d48c045f3357c652f2934a5627610ecbd640a0859d7a4440165719535427deb0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d48c045f3357c652f2934a5627610ecbd640a0859d7a4440165719535427deb0", kill_on_drop: false }`
[INFO] [stdout] d48c045f3357c652f2934a5627610ecbd640a0859d7a4440165719535427deb0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 46530d9add906178ff94df4dc6d5b0752c4d25b140f6e9286c54e53d87f82ab3
[INFO] running `Command { std: "docker" "start" "-a" "46530d9add906178ff94df4dc6d5b0752c4d25b140f6e9286c54e53d87f82ab3", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `statements`
[INFO] [stderr]    --> type-system/src/lib.rs:229:14
[INFO] [stderr]     |
[INFO] [stderr] 229 | pub fn infer(statements: Vec<Statement<()>>) -> Result<Vec<Statement<Type>>, TypeError> {
[INFO] [stderr]     |              ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `kind`
[INFO] [stderr]    --> type-system/src/ty.rs:162:8
[INFO] [stderr]     |
[INFO] [stderr] 162 |     fn kind(&self) -> Kind {
[INFO] [stderr]     |        ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `free_vars`
[INFO] [stderr]    --> type-system/src/ty.rs:168:8
[INFO] [stderr]     |
[INFO] [stderr] 168 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stderr]     |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `free_vars`
[INFO] [stderr]    --> type-system/src/ty.rs:187:8
[INFO] [stderr]     |
[INFO] [stderr] 187 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stderr]     |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `substitute`
[INFO] [stderr]    --> type-system/src/ty.rs:194:8
[INFO] [stderr]     |
[INFO] [stderr] 194 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stderr]     |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `filter_off`
[INFO] [stderr]    --> type-system/src/ty.rs:244:8
[INFO] [stderr]     |
[INFO] [stderr] 244 |     fn filter_off(&mut self, vars: &HashSet<KindedVar<'a>>) {
[INFO] [stderr]     |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `hashmap_mut`
[INFO] [stderr]    --> type-system/src/ty.rs:276:8
[INFO] [stderr]     |
[INFO] [stderr] 276 |     fn hashmap_mut(&mut self) -> &mut HashMap<Var<'a>, Scheme<'a>> {
[INFO] [stderr]     |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `remove`
[INFO] [stderr]    --> type-system/src/ty.rs:283:8
[INFO] [stderr]     |
[INFO] [stderr] 283 |     fn remove(&mut self, var: Var<'a>) {
[INFO] [stderr]     |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `free_vars`
[INFO] [stderr]    --> type-system/src/ty.rs:286:8
[INFO] [stderr]     |
[INFO] [stderr] 286 |     fn free_vars(&self) -> HashSet<KindedVar<'a>> {
[INFO] [stderr]     |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `substitute`
[INFO] [stderr]    --> type-system/src/ty.rs:292:8
[INFO] [stderr]     |
[INFO] [stderr] 292 |     fn substitute(&mut self, subs: &Subs<'a>) -> Result<(), TypeError> {
[INFO] [stderr]     |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `generalize`
[INFO] [stderr]    --> type-system/src/ty.rs:298:8
[INFO] [stderr]     |
[INFO] [stderr] 298 |     fn generalize(&self, ty: Type<'a>) -> Scheme<'a> {
[INFO] [stderr]     |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `type-system` (lib) generated 11 warnings
[INFO] [stderr] warning: `type-system` (lib test) generated 11 warnings (11 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/butter-beb0e3726e23a0f2)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/hir-a81f6a008dfbb656)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/parser-6d8f3b491b3ba263)
[INFO] [stdout] 
[INFO] [stdout] running 22 tests
[INFO] [stdout] test expr::integer::test::decimal ... ok
[INFO] [stdout] test expr::integer::test::bin ... ok
[INFO] [stdout] test expr::float::test::float_1 ... ok
[INFO] [stdout] test expr::float::test::float_2 ... ok
[INFO] [stdout] test expr::float::test::not_float ... ok
[INFO] [stdout] test expr::float::test::float_3 ... ok
[INFO] [stdout] test expr::integer::test::hex ... ok
[INFO] [stdout] test expr::integer::test::oct ... ok
[INFO] [stdout] test expr::string::test::string ... ok
[INFO] [stdout] test ident_keyword::test::test_ident_or_keyword ... ok
[INFO] [stdout] test ident_keyword::test::test_keyword ... ok
[INFO] [stdout] test ident_keyword::test::non_ident ... ok
[INFO] [stdout] test ident_keyword::test::non_keyword ... ok
[INFO] [stdout] test test::insignificant ... ok
[INFO] [stdout] test expr::test::ignore_range ... ok
[INFO] [stdout] test expr::test::ignore_higher_precedence ... ok
[INFO] [stdout] test expr::test::right_associative ... ok
[INFO] [stdout] test expr::test::group ... ok
[INFO] [stdout] test statement::test::var ... ok
[INFO] [stdout] test statement::test::chain_assign ... ok
[INFO] [stdout] test expr::test::precedence ... ok
[INFO] [stdout] test statement::test::parallel_assign ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 22 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/type_system-bc2a326ac20d5f95)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests hir
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests parser
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests type-system
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "46530d9add906178ff94df4dc6d5b0752c4d25b140f6e9286c54e53d87f82ab3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46530d9add906178ff94df4dc6d5b0752c4d25b140f6e9286c54e53d87f82ab3", kill_on_drop: false }`
[INFO] [stdout] 46530d9add906178ff94df4dc6d5b0752c4d25b140f6e9286c54e53d87f82ab3