[INFO] cloning repository https://github.com/cronokirby/ovis
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cronokirby/ovis" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcronokirby%2Fovis", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcronokirby%2Fovis'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ea94e16f59887ffb3f6d6a4ed7c703b1a02e1d6b
[INFO] checking cronokirby/ovis against try#894d32a5432c6a6461bb2aac7c3d5f2e87dce83f for pr-77015
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcronokirby%2Fovis" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cronokirby/ovis on toolchain 894d32a5432c6a6461bb2aac7c3d5f2e87dce83f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cronokirby/ovis
[INFO] finished tweaking git repo https://github.com/cronokirby/ovis
[INFO] tweaked toml for git repo https://github.com/cronokirby/ovis written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/cronokirby/ovis already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 79a20fb3332363f856036eea3cb6c0c60a434f7cebbc61473ca268aee38b6b3b
[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" "79a20fb3332363f856036eea3cb6c0c60a434f7cebbc61473ca268aee38b6b3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "79a20fb3332363f856036eea3cb6c0c60a434f7cebbc61473ca268aee38b6b3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "79a20fb3332363f856036eea3cb6c0c60a434f7cebbc61473ca268aee38b6b3b", kill_on_drop: false }`
[INFO] [stdout] 79a20fb3332363f856036eea3cb6c0c60a434f7cebbc61473ca268aee38b6b3b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cd666f97d30dbfd13541d33ddf4425acccfe9b03cb3267760e54b6f07a76f53a
[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" "cd666f97d30dbfd13541d33ddf4425acccfe9b03cb3267760e54b6f07a76f53a", kill_on_drop: false }`
[INFO] [stderr]    Compiling peg-runtime v0.6.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling peg-macros v0.6.3
[INFO] [stderr]     Checking peg v0.6.3
[INFO] [stderr]     Checking ovis v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `SameType`
[INFO] [stdout]   --> src/typer.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     SameType(Type, Type),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ExplicitInst`
[INFO] [stdout]   --> src/typer.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     ExplicitInst(Type, Scheme),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ImplicitInst`
[INFO] [stdout]   --> src/typer.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     ImplicitInst(Type, HashSet<TypeVar>, Type),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `active_type_vars`
[INFO] [stdout]   --> src/typer.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn active_type_vars(&self, buf: &mut HashSet<TypeVar>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty`
[INFO] [stdout]   --> src/typer.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn empty() -> Self {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add`
[INFO] [stdout]   --> src/typer.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn add(&mut self, var: TypeVar, typ: Type) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Assumptions`
[INFO] [stdout]    --> src/typer.rs:158:8
[INFO] [stdout]     |
[INFO] [stdout] 158 | struct Assumptions(Vec<(Var, Type)>);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty`
[INFO] [stdout]    --> src/typer.rs:162:8
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn empty() -> Self {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extend`
[INFO] [stdout]    --> src/typer.rs:167:8
[INFO] [stdout]     |
[INFO] [stdout] 167 |     fn extend(&mut self, var: Var, typ: Type) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `vars`
[INFO] [stdout]    --> src/typer.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn vars(&self, buf: &mut HashSet<Var>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `SameType`
[INFO] [stdout]   --> src/typer.rs:17:5
[INFO] [stdout]    |
[INFO] [stdout] 17 |     SameType(Type, Type),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ExplicitInst`
[INFO] [stdout]   --> src/typer.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 19 |     ExplicitInst(Type, Scheme),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `ImplicitInst`
[INFO] [stdout]   --> src/typer.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     ImplicitInst(Type, HashSet<TypeVar>, Type),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `active_type_vars`
[INFO] [stdout]   --> src/typer.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn active_type_vars(&self, buf: &mut HashSet<TypeVar>) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty`
[INFO] [stdout]   --> src/typer.rs:54:8
[INFO] [stdout]    |
[INFO] [stdout] 54 |     fn empty() -> Self {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `add`
[INFO] [stdout]   --> src/typer.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn add(&mut self, var: TypeVar, typ: Type) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Assumptions`
[INFO] [stdout]    --> src/typer.rs:158:8
[INFO] [stdout]     |
[INFO] [stdout] 158 | struct Assumptions(Vec<(Var, Type)>);
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty`
[INFO] [stdout]    --> src/typer.rs:162:8
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn empty() -> Self {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extend`
[INFO] [stdout]    --> src/typer.rs:167:8
[INFO] [stdout]     |
[INFO] [stdout] 167 |     fn extend(&mut self, var: Var, typ: Type) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `vars`
[INFO] [stdout]    --> src/typer.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn vars(&self, buf: &mut HashSet<Var>) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.33s
[INFO] running `Command { std: "docker" "inspect" "cd666f97d30dbfd13541d33ddf4425acccfe9b03cb3267760e54b6f07a76f53a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd666f97d30dbfd13541d33ddf4425acccfe9b03cb3267760e54b6f07a76f53a", kill_on_drop: false }`
[INFO] [stdout] cd666f97d30dbfd13541d33ddf4425acccfe9b03cb3267760e54b6f07a76f53a