Dec 18 03:18:53.043 INFO checking binshengliu/rforests against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 03:18:53.043 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-4/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/binshengliu/rforests:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 03:18:53.448 INFO [stdout] 7a293f7a1141ebc5623a62ed1bb5cd92b6b2ed05d94ed0272b56a8b1b923d4a9
Dec 18 03:18:53.452 INFO running `"docker" "start" "-a" "7a293f7a1141ebc5623a62ed1bb5cd92b6b2ed05d94ed0272b56a8b1b923d4a9"`
Dec 18 03:18:55.272 INFO [stderr]     Checking memchr v1.0.2
Dec 18 03:18:55.272 INFO [stderr]     Checking clap v2.27.0
Dec 18 03:18:55.728 INFO [stderr]     Checking aho-corasick v0.6.3
Dec 18 03:18:56.620 INFO [stderr]     Checking regex v0.2.2
Dec 18 03:19:00.192 INFO [stderr]     Checking env_logger v0.4.3
Dec 18 03:19:04.292 INFO [stderr]     Checking rforests v0.1.0 (/opt/crater/workdir)
Dec 18 03:19:05.812 INFO [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
Dec 18 03:19:05.812 INFO [stderr]  --> src/lib.rs:2:12
Dec 18 03:19:05.812 INFO [stderr]   |
Dec 18 03:19:05.812 INFO [stderr] 2 | #![feature(conservative_impl_trait)]
Dec 18 03:19:05.812 INFO [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:19:05.812 INFO [stderr]   |
Dec 18 03:19:05.812 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 03:19:05.812 INFO [stderr] 
Dec 18 03:19:05.812 INFO [stderr] warning: the feature `ord_max_min` has been stable since 1.21.0 and no longer requires an attribute to enable
Dec 18 03:19:05.812 INFO [stderr]  --> src/lib.rs:1:12
Dec 18 03:19:05.812 INFO [stderr]   |
Dec 18 03:19:05.812 INFO [stderr] 1 | #![feature(ord_max_min)]
Dec 18 03:19:05.812 INFO [stderr]   |            ^^^^^^^^^^^
Dec 18 03:19:05.812 INFO [stderr] 
Dec 18 03:19:05.899 INFO [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
Dec 18 03:19:05.899 INFO [stderr]  --> src/lib.rs:2:12
Dec 18 03:19:05.899 INFO [stderr]   |
Dec 18 03:19:05.900 INFO [stderr] 2 | #![feature(conservative_impl_trait)]
Dec 18 03:19:05.900 INFO [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:19:05.900 INFO [stderr]   |
Dec 18 03:19:05.900 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 03:19:05.900 INFO [stderr] 
Dec 18 03:19:05.900 INFO [stderr] warning: the feature `ord_max_min` has been stable since 1.21.0 and no longer requires an attribute to enable
Dec 18 03:19:05.900 INFO [stderr]  --> src/lib.rs:1:12
Dec 18 03:19:05.900 INFO [stderr]   |
Dec 18 03:19:05.900 INFO [stderr] 1 | #![feature(ord_max_min)]
Dec 18 03:19:05.900 INFO [stderr]   |            ^^^^^^^^^^^
Dec 18 03:19:05.900 INFO [stderr] 
Dec 18 03:19:06.994 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.83s
Dec 18 03:19:07.670 INFO running `"docker" "inspect" "7a293f7a1141ebc5623a62ed1bb5cd92b6b2ed05d94ed0272b56a8b1b923d4a9"`
Dec 18 03:19:08.022 INFO running `"docker" "rm" "-f" "7a293f7a1141ebc5623a62ed1bb5cd92b6b2ed05d94ed0272b56a8b1b923d4a9"`
Dec 18 03:19:08.336 INFO [stdout] 7a293f7a1141ebc5623a62ed1bb5cd92b6b2ed05d94ed0272b56a8b1b923d4a9