Dec 11 05:17:01.109 INFO checking zabio3/peano against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 05:17:01.109 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-2/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-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"`
Dec 11 05:17:01.480 INFO [stdout] f58071be0c59eb99fd6424d3774844a6ec69e9babb68c477ca3605c172db87fc
Dec 11 05:17:01.482 INFO running `"docker" "start" "-a" "f58071be0c59eb99fd6424d3774844a6ec69e9babb68c477ca3605c172db87fc"`
Dec 11 05:17:02.731 INFO [stderr] usermod: no changes
Dec 11 05:17:02.784 INFO [stderr]     Checking peano v0.1.0 (/source)
Dec 11 05:17:02.980 INFO [stderr] warning: enum is never used: `Peano`
Dec 11 05:17:02.980 INFO [stderr]  --> src/main.rs:2:1
Dec 11 05:17:02.980 INFO [stderr]   |
Dec 11 05:17:02.980 INFO [stderr] 2 | enum Peano<'a> {
Dec 11 05:17:02.980 INFO [stderr]   | ^^^^^^^^^^^^^^
Dec 11 05:17:02.980 INFO [stderr]   |
Dec 11 05:17:02.980 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 11 05:17:02.980 INFO [stderr] 
Dec 11 05:17:02.980 INFO [stderr] warning: method is never used: `to_i`
Dec 11 05:17:02.980 INFO [stderr]   --> src/main.rs:13:5
Dec 11 05:17:02.980 INFO [stderr]    |
Dec 11 05:17:02.980 INFO [stderr] 13 |     fn to_i(&self) -> u32 {
Dec 11 05:17:02.980 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 11 05:17:02.980 INFO [stderr] 
Dec 11 05:17:02.980 INFO [stderr] warning: function is never used: `zero`
Dec 11 05:17:02.980 INFO [stderr]   --> src/main.rs:21:1
Dec 11 05:17:02.980 INFO [stderr]    |
Dec 11 05:17:02.980 INFO [stderr] 21 | fn zero<'a>() -> Peano<'a> {
Dec 11 05:17:02.981 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 05:17:02.981 INFO [stderr] 
Dec 11 05:17:02.981 INFO [stderr] warning: function is never used: `suc`
Dec 11 05:17:02.981 INFO [stderr]   --> src/main.rs:26:1
Dec 11 05:17:02.981 INFO [stderr]    |
Dec 11 05:17:02.981 INFO [stderr] 26 | fn suc<'a>(n: &'a Peano) -> Peano<'a> {
Dec 11 05:17:02.981 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 05:17:02.981 INFO [stderr] 
Dec 11 05:17:03.040 INFO [stderr] warning: variant is never constructed: `Suc`
Dec 11 05:17:03.040 INFO [stderr]  --> src/main.rs:8:5
Dec 11 05:17:03.040 INFO [stderr]   |
Dec 11 05:17:03.040 INFO [stderr] 8 |     Suc(&'a Peano<'a>),
Dec 11 05:17:03.040 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^
Dec 11 05:17:03.040 INFO [stderr]   |
Dec 11 05:17:03.040 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 11 05:17:03.040 INFO [stderr] 
Dec 11 05:17:03.040 INFO [stderr] warning: function is never used: `suc`
Dec 11 05:17:03.040 INFO [stderr]   --> src/main.rs:26:1
Dec 11 05:17:03.040 INFO [stderr]    |
Dec 11 05:17:03.040 INFO [stderr] 26 | fn suc<'a>(n: &'a Peano) -> Peano<'a> {
Dec 11 05:17:03.040 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 05:17:03.040 INFO [stderr] 
Dec 11 05:17:03.084 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.32s
Dec 11 05:17:03.084 INFO [stderr] su: No module specific data is present
Dec 11 05:17:04.392 INFO running `"docker" "inspect" "f58071be0c59eb99fd6424d3774844a6ec69e9babb68c477ca3605c172db87fc"`
Dec 11 05:17:04.656 INFO running `"docker" "rm" "-f" "f58071be0c59eb99fd6424d3774844a6ec69e9babb68c477ca3605c172db87fc"`
Dec 11 05:17:04.916 INFO [stdout] f58071be0c59eb99fd6424d3774844a6ec69e9babb68c477ca3605c172db87fc