Nov 28 23:52:16.248 INFO checking hindley-milner-0.1.0 against master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5 for pr-56074
Nov 28 23:52:16.248 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-4/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56074/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +0b9f19dff1347e29bf4362ab5a8fab84b43023b5-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 28 23:52:16.545 INFO [stdout] 91848b1b7391212d1cc4124bb80df9b3017fe8b84864e814f4aa1aee3fd4d850
Nov 28 23:52:16.550 INFO running `"docker" "start" "-a" "91848b1b7391212d1cc4124bb80df9b3017fe8b84864e814f4aa1aee3fd4d850"`
Nov 28 23:52:17.912 INFO [stderr] usermod: no changes
Nov 28 23:52:18.016 INFO [stderr]     Checking hindley-milner v0.1.0 (/source)
Nov 28 23:52:18.818 INFO [stderr] warning: struct is never constructed: `Namer`
Nov 28 23:52:18.818 INFO [stderr]   --> src/lib.rs:77:1
Nov 28 23:52:18.818 INFO [stderr]    |
Nov 28 23:52:18.818 INFO [stderr] 77 | struct Namer {
Nov 28 23:52:18.818 INFO [stderr]    | ^^^^^^^^^^^^
Nov 28 23:52:18.818 INFO [stderr]    |
Nov 28 23:52:18.818 INFO [stderr]    = note: #[warn(dead_code)] on by default
Nov 28 23:52:18.818 INFO [stderr] 
Nov 28 23:52:18.818 INFO [stderr] warning: method is never used: `next`
Nov 28 23:52:18.818 INFO [stderr]   --> src/lib.rs:83:5
Nov 28 23:52:18.818 INFO [stderr]    |
Nov 28 23:52:18.819 INFO [stderr] 83 |     fn next(&mut self) -> String {
Nov 28 23:52:18.819 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 23:52:18.819 INFO [stderr] 
Nov 28 23:52:18.819 INFO [stderr] warning: method is never used: `name`
Nov 28 23:52:18.819 INFO [stderr]   --> src/lib.rs:89:5
Nov 28 23:52:18.819 INFO [stderr]    |
Nov 28 23:52:18.819 INFO [stderr] 89 |     fn name(&mut self, t: ArenaType) -> String {
Nov 28 23:52:18.819 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 23:52:18.819 INFO [stderr] 
Nov 28 23:52:18.819 INFO [stderr] warning: method is never used: `id`
Nov 28 23:52:18.819 INFO [stderr]    --> src/lib.rs:124:5
Nov 28 23:52:18.819 INFO [stderr]     |
Nov 28 23:52:18.819 INFO [stderr] 124 |     fn id(&self) -> usize {
Nov 28 23:52:18.819 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Nov 28 23:52:18.819 INFO [stderr] 
Nov 28 23:52:18.819 INFO [stderr] warning: method is never used: `as_string`
Nov 28 23:52:18.819 INFO [stderr]    --> src/lib.rs:146:5
Nov 28 23:52:18.819 INFO [stderr]     |
Nov 28 23:52:18.819 INFO [stderr] 146 |     fn as_string(&self, a: &Vec<Type>, namer: &mut Namer) -> String {
Nov 28 23:52:18.820 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 23:52:18.820 INFO [stderr] 
Nov 28 23:52:18.820 INFO [stderr] warning: function is never used: `test_env`
Nov 28 23:52:18.820 INFO [stderr]    --> src/lib.rs:537:1
Nov 28 23:52:18.820 INFO [stderr]     |
Nov 28 23:52:18.820 INFO [stderr] 537 | fn test_env() -> (Vec<Type>, Env) {
Nov 28 23:52:18.820 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 23:52:18.821 INFO [stderr] 
Nov 28 23:52:19.072 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.13s
Nov 28 23:52:19.075 INFO [stderr] su: No module specific data is present
Nov 28 23:52:19.493 INFO running `"docker" "inspect" "91848b1b7391212d1cc4124bb80df9b3017fe8b84864e814f4aa1aee3fd4d850"`
Nov 28 23:52:19.769 INFO running `"docker" "rm" "-f" "91848b1b7391212d1cc4124bb80df9b3017fe8b84864e814f4aa1aee3fd4d850"`
Nov 28 23:52:20.073 INFO [stdout] 91848b1b7391212d1cc4124bb80df9b3017fe8b84864e814f4aa1aee3fd4d850