[INFO] cloning repository https://github.com/Guaschman/hm-interpreter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Guaschman/hm-interpreter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGuaschman%2Fhm-interpreter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGuaschman%2Fhm-interpreter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4a94ae4fa5d4dd7c3849dc6d9075a3e1748a973d
[INFO] checking Guaschman/hm-interpreter against master#4c5f6e6277b89e47d73a192078697f7a5f3dc0ac for pr-97086
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGuaschman%2Fhm-interpreter" "/workspace/builds/worker-67/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-67/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Guaschman/hm-interpreter on toolchain 4c5f6e6277b89e47d73a192078697f7a5f3dc0ac
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4c5f6e6277b89e47d73a192078697f7a5f3dc0ac" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Guaschman/hm-interpreter
[INFO] finished tweaking git repo https://github.com/Guaschman/hm-interpreter
[INFO] tweaked toml for git repo https://github.com/Guaschman/hm-interpreter written to /workspace/builds/worker-67/source/Cargo.toml
[INFO] crate git repo https://github.com/Guaschman/hm-interpreter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4c5f6e6277b89e47d73a192078697f7a5f3dc0ac" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nom-trace v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+4c5f6e6277b89e47d73a192078697f7a5f3dc0ac" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7d99801c2c746ebc45515f9ca83c9807af7cfcd48779a86cceb9c7a16572bee0
[INFO] running `Command { std: "docker" "start" "-a" "7d99801c2c746ebc45515f9ca83c9807af7cfcd48779a86cceb9c7a16572bee0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d99801c2c746ebc45515f9ca83c9807af7cfcd48779a86cceb9c7a16572bee0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d99801c2c746ebc45515f9ca83c9807af7cfcd48779a86cceb9c7a16572bee0", kill_on_drop: false }`
[INFO] [stdout] 7d99801c2c746ebc45515f9ca83c9807af7cfcd48779a86cceb9c7a16572bee0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+4c5f6e6277b89e47d73a192078697f7a5f3dc0ac" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5c3cbcb6e6aa749b22860a06102a59374962a425ba1967427f0b79e70f485ed9
[INFO] running `Command { std: "docker" "start" "-a" "5c3cbcb6e6aa749b22860a06102a59374962a425ba1967427f0b79e70f485ed9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking ryu v1.0.10
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking nom-trace v0.1.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking uuid v0.1.18
[INFO] [stderr]     Checking hm-interpreter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `extend`
[INFO] [stdout]   --> src/type_checker.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn extend(mut self, (v, s): (Var, Scheme)) {
[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: `remove`
[INFO] [stdout]   --> src/type_checker.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 |     fn remove(mut self, var: Var) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extend`
[INFO] [stdout]   --> src/type_checker.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 |     fn extend(mut self, (v, s): (Var, Scheme)) {
[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: `remove`
[INFO] [stdout]   --> src/type_checker.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 |     fn remove(mut self, var: Var) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::collections::btree_set::Union` that must be used
[INFO] [stdout]    --> src/type_checker.rs:100:17
[INFO] [stdout]     |
[INFO] [stdout] 100 |                 set.union(&a1.ftv());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this returns the union as an iterator, without modifying either input set
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::collections::btree_set::Union` that must be used
[INFO] [stdout]    --> src/type_checker.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |                 set.union(&a2.ftv());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the union as an iterator, without modifying either input set
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::collections::btree_set::Union` that must be used
[INFO] [stdout]    --> src/type_checker.rs:127:17
[INFO] [stdout]     |
[INFO] [stdout] 127 |                 set.union(&t.ftv());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the union as an iterator, without modifying either input set
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::collections::btree_set::Difference` that must be used
[INFO] [stdout]    --> src/type_checker.rs:128:17
[INFO] [stdout]     |
[INFO] [stdout] 128 |                 set.difference(&BTreeSet::from_iter(tv.iter().cloned()));
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the difference as an iterator, without modifying either input set
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::collections::btree_set::Union` that must be used
[INFO] [stdout]    --> src/type_checker.rs:100:17
[INFO] [stdout]     |
[INFO] [stdout] 100 |                 set.union(&a1.ftv());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this returns the union as an iterator, without modifying either input set
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::collections::btree_set::Union` that must be used
[INFO] [stdout]    --> src/type_checker.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |                 set.union(&a2.ftv());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the union as an iterator, without modifying either input set
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::collections::btree_set::Union` that must be used
[INFO] [stdout]    --> src/type_checker.rs:127:17
[INFO] [stdout]     |
[INFO] [stdout] 127 |                 set.union(&t.ftv());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the union as an iterator, without modifying either input set
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::collections::btree_set::Difference` that must be used
[INFO] [stdout]    --> src/type_checker.rs:128:17
[INFO] [stdout]     |
[INFO] [stdout] 128 |                 set.difference(&BTreeSet::from_iter(tv.iter().cloned()));
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the difference as an iterator, without modifying either input set
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 47.97s
[INFO] running `Command { std: "docker" "inspect" "5c3cbcb6e6aa749b22860a06102a59374962a425ba1967427f0b79e70f485ed9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c3cbcb6e6aa749b22860a06102a59374962a425ba1967427f0b79e70f485ed9", kill_on_drop: false }`
[INFO] [stdout] 5c3cbcb6e6aa749b22860a06102a59374962a425ba1967427f0b79e70f485ed9