Dec 18 04:13:45.296 INFO checking alexcrichton/l4c against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 04:13:45.296 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/alexcrichton/l4c:/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 04:13:45.574 INFO [stdout] ec50d47a45511a71102f212b4c2ff6fa42c205e4fc6c4da0cab12ff7d5aaaf57
Dec 18 04:13:45.578 INFO running `"docker" "start" "-a" "ec50d47a45511a71102f212b4c2ff6fa42c205e4fc6c4da0cab12ff7d5aaaf57"`
Dec 18 04:13:46.220 INFO [stderr]     Checking log v0.4.5
Dec 18 04:13:46.220 INFO [stderr]     Checking driver v0.1.0 (/opt/crater/workdir/driver)
Dec 18 04:13:46.744 INFO [stderr]     Checking env_logger v0.5.13
Dec 18 04:13:46.892 INFO [stderr] warning: field is never used: `retry`
Dec 18 04:13:46.892 INFO [stderr]   --> driver/src/main.rs:33:5
Dec 18 04:13:46.892 INFO [stderr]    |
Dec 18 04:13:46.892 INFO [stderr] 33 |     retry: bool,
Dec 18 04:13:46.892 INFO [stderr]    |     ^^^^^^^^^^^
Dec 18 04:13:46.892 INFO [stderr]    |
Dec 18 04:13:46.892 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 18 04:13:46.892 INFO [stderr] 
Dec 18 04:13:46.893 INFO [stderr] warning: field is never used: `retry`
Dec 18 04:13:46.893 INFO [stderr]   --> driver/src/main.rs:33:5
Dec 18 04:13:46.893 INFO [stderr]    |
Dec 18 04:13:46.893 INFO [stderr] 33 |     retry: bool,
Dec 18 04:13:46.893 INFO [stderr]    |     ^^^^^^^^^^^
Dec 18 04:13:46.893 INFO [stderr]    |
Dec 18 04:13:46.893 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 18 04:13:46.893 INFO [stderr] 
Dec 18 04:13:47.528 INFO [stderr]     Checking l4c v0.0.0 (/opt/crater/workdir)
Dec 18 04:13:50.740 INFO [stderr] warning: unused import: `Display`
Dec 18 04:13:50.740 INFO [stderr]  --> src/front/pp.rs:1:16
Dec 18 04:13:50.740 INFO [stderr]   |
Dec 18 04:13:50.740 INFO [stderr] 1 | use std::fmt::{Display, Write};
Dec 18 04:13:50.740 INFO [stderr]   |                ^^^^^^^
Dec 18 04:13:50.740 INFO [stderr]   |
Dec 18 04:13:50.740 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 04:13:50.740 INFO [stderr] 
Dec 18 04:13:50.796 INFO [stderr] warning: unused import: `Display`
Dec 18 04:13:50.796 INFO [stderr]  --> src/front/pp.rs:1:16
Dec 18 04:13:50.796 INFO [stderr]   |
Dec 18 04:13:50.796 INFO [stderr] 1 | use std::fmt::{Display, Write};
Dec 18 04:13:50.796 INFO [stderr]   |                ^^^^^^^
Dec 18 04:13:50.796 INFO [stderr]   |
Dec 18 04:13:50.796 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 04:13:50.796 INFO [stderr] 
Dec 18 04:13:52.256 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.08s
Dec 18 04:13:52.816 INFO running `"docker" "inspect" "ec50d47a45511a71102f212b4c2ff6fa42c205e4fc6c4da0cab12ff7d5aaaf57"`
Dec 18 04:13:53.055 INFO running `"docker" "rm" "-f" "ec50d47a45511a71102f212b4c2ff6fa42c205e4fc6c4da0cab12ff7d5aaaf57"`
Dec 18 04:13:53.306 INFO [stdout] ec50d47a45511a71102f212b4c2ff6fa42c205e4fc6c4da0cab12ff7d5aaaf57