[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] 5dd8a05ad61e5eda960d78a74e22a16b6a877bcd
[INFO] checking neverRare/butter against try#b20a093d9fb1ffaa04ae9852cb034864a992bafd for pr-85073
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FneverRare%2Fbutter" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/neverRare/butter on toolchain b20a093d9fb1ffaa04ae9852cb034864a992bafd
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "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-4/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" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded id-arena v2.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 39d3ef7d0a01431e98e71380de5a8d16a920caa0703386706ed3936bc5213561
[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" "39d3ef7d0a01431e98e71380de5a8d16a920caa0703386706ed3936bc5213561", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "39d3ef7d0a01431e98e71380de5a8d16a920caa0703386706ed3936bc5213561", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39d3ef7d0a01431e98e71380de5a8d16a920caa0703386706ed3936bc5213561", kill_on_drop: false }`
[INFO] [stdout] 39d3ef7d0a01431e98e71380de5a8d16a920caa0703386706ed3936bc5213561
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84b1fe2f594ae22c4e3d2a2fdecd8f2ae414acb75e9aadf24d4db431342d4906
[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" "84b1fe2f594ae22c4e3d2a2fdecd8f2ae414acb75e9aadf24d4db431342d4906", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking id-arena v2.2.1
[INFO] [stderr]     Checking type-system v0.1.0 (/opt/rustwide/workdir/type-system)
[INFO] [stderr]     Checking ir v0.1.0 (/opt/rustwide/workdir/ir)
[INFO] [stdout] warning: variant is never constructed: `Unit`
[INFO] [stdout]   --> type-system/src/cons.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     Unit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Num`
[INFO] [stdout]   --> type-system/src/cons.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     Num,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Bool`
[INFO] [stdout]   --> type-system/src/cons.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Bool,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Ref`
[INFO] [stdout]   --> type-system/src/cons.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     Ref(MutType<'a>, Box<Type<'a>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Array`
[INFO] [stdout]   --> type-system/src/cons.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     Array(Box<Type<'a>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Record`
[INFO] [stdout]   --> type-system/src/cons.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     Record(RecordCons<'a>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Fun`
[INFO] [stdout]   --> type-system/src/cons.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     Fun(Box<Type<'a>>, Box<Type<'a>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Union`
[INFO] [stdout]   --> type-system/src/cons.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     Union(Union<'a>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]   --> type-system/src/cons.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub 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/cons.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     pub 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/cons.rs:138:12
[INFO] [stdout]     |
[INFO] [stdout] 138 |     pub fn unify_with(
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `intersection`
[INFO] [stdout]    --> type-system/src/cons.rs:260:4
[INFO] [stdout]     |
[INFO] [stdout] 260 | 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/lib.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/lib.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/lib.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/lib.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/lib.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     MutType,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> type-system/src/lib.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 48 |     Cons(Cons<'a>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]   --> type-system/src/lib.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/lib.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/lib.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: variant is never constructed: `Imm`
[INFO] [stdout]    --> type-system/src/lib.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 100 |     Imm,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Mut`
[INFO] [stdout]    --> type-system/src/lib.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 101 |     Mut,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.rs:221:8
[INFO] [stdout]     |
[INFO] [stdout] 221 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap`
[INFO] [stdout]    --> type-system/src/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.rs:264:8
[INFO] [stdout]     |
[INFO] [stdout] 264 | 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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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: enum is never used: `TypeError`
[INFO] [stdout]    --> type-system/src/lib.rs:299:6
[INFO] [stdout]     |
[INFO] [stdout] 299 | enum TypeError {
[INFO] [stdout]     |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 48 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Ir`
[INFO] [stdout]  --> ir/src/lib.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Ir {
[INFO] [stdout]   |        ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Fun`
[INFO] [stdout]  --> ir/src/lib.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Fun {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Op`
[INFO] [stdout]   --> ir/src/lib.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | enum Op {
[INFO] [stdout]    |      ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Ir`
[INFO] [stdout]  --> ir/src/lib.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | struct Ir {
[INFO] [stdout]   |        ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Fun`
[INFO] [stdout]  --> ir/src/lib.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Fun {
[INFO] [stdout]   |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Op`
[INFO] [stdout]   --> ir/src/lib.rs:12:6
[INFO] [stdout]    |
[INFO] [stdout] 12 | enum Op {
[INFO] [stdout]    |      ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Unit`
[INFO] [stdout]   --> type-system/src/cons.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     Unit,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Num`
[INFO] [stdout]   --> type-system/src/cons.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     Num,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Bool`
[INFO] [stdout]   --> type-system/src/cons.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     Bool,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Ref`
[INFO] [stdout]   --> type-system/src/cons.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     Ref(MutType<'a>, Box<Type<'a>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Array`
[INFO] [stdout]   --> type-system/src/cons.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     Array(Box<Type<'a>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Record`
[INFO] [stdout]   --> type-system/src/cons.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     Record(RecordCons<'a>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Fun`
[INFO] [stdout]   --> type-system/src/cons.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     Fun(Box<Type<'a>>, Box<Type<'a>>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Union`
[INFO] [stdout]   --> type-system/src/cons.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     Union(Union<'a>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]   --> type-system/src/cons.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 |     pub 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/cons.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |     pub 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/cons.rs:138:12
[INFO] [stdout]     |
[INFO] [stdout] 138 |     pub fn unify_with(
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `intersection`
[INFO] [stdout]    --> type-system/src/cons.rs:260:4
[INFO] [stdout]     |
[INFO] [stdout] 260 | 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/lib.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/lib.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/lib.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/lib.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/lib.rs:38:5
[INFO] [stdout]    |
[INFO] [stdout] 38 |     MutType,
[INFO] [stdout]    |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]   --> type-system/src/lib.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 48 |     Cons(Cons<'a>),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]   --> type-system/src/lib.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/lib.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/lib.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: variant is never constructed: `Imm`
[INFO] [stdout]    --> type-system/src/lib.rs:100:5
[INFO] [stdout]     |
[INFO] [stdout] 100 |     Imm,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Mut`
[INFO] [stdout]    --> type-system/src/lib.rs:101:5
[INFO] [stdout]     |
[INFO] [stdout] 101 |     Mut,
[INFO] [stdout]     |     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free_vars`
[INFO] [stdout]    --> type-system/src/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.rs:221:8
[INFO] [stdout]     |
[INFO] [stdout] 221 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `hashmap`
[INFO] [stdout]    --> type-system/src/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.rs:264:8
[INFO] [stdout]     |
[INFO] [stdout] 264 | 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/lib.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/lib.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/lib.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/lib.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/lib.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/lib.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: enum is never used: `TypeError`
[INFO] [stdout]    --> type-system/src/lib.rs:299:6
[INFO] [stdout]     |
[INFO] [stdout] 299 | enum TypeError {
[INFO] [stdout]     |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 48 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking combine v4.5.2
[INFO] [stderr]     Checking parser v0.1.0 (/opt/rustwide/workdir/parser)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.61s
[INFO] running `Command { std: "docker" "inspect" "84b1fe2f594ae22c4e3d2a2fdecd8f2ae414acb75e9aadf24d4db431342d4906", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84b1fe2f594ae22c4e3d2a2fdecd8f2ae414acb75e9aadf24d4db431342d4906", kill_on_drop: false }`
[INFO] [stdout] 84b1fe2f594ae22c4e3d2a2fdecd8f2ae414acb75e9aadf24d4db431342d4906