Dec 19 20:42:13.499 INFO checking alexcrichton/l4c against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 20:42:13.499 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-7/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 20:42:13.682 INFO [stdout] 04691f29561cdf09b078de8c8395d8adb333d31fad72e6d33c278ce2d827388e
Dec 19 20:42:13.686 INFO running `"docker" "start" "-a" "04691f29561cdf09b078de8c8395d8adb333d31fad72e6d33c278ce2d827388e"`
Dec 19 20:42:14.274 INFO [stderr]     Checking log v0.4.5
Dec 19 20:42:14.274 INFO [stderr]     Checking driver v0.1.0 (/opt/crater/workdir/driver)
Dec 19 20:42:14.801 INFO [stderr]     Checking env_logger v0.5.13
Dec 19 20:42:15.152 INFO [stderr] warning: field is never used: `retry`
Dec 19 20:42:15.152 INFO [stderr]   --> driver/src/main.rs:33:5
Dec 19 20:42:15.152 INFO [stderr]    |
Dec 19 20:42:15.152 INFO [stderr] 33 |     retry: bool,
Dec 19 20:42:15.152 INFO [stderr]    |     ^^^^^^^^^^^
Dec 19 20:42:15.152 INFO [stderr]    |
Dec 19 20:42:15.152 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 19 20:42:15.152 INFO [stderr] 
Dec 19 20:42:15.200 INFO [stderr] warning: field is never used: `retry`
Dec 19 20:42:15.200 INFO [stderr]   --> driver/src/main.rs:33:5
Dec 19 20:42:15.200 INFO [stderr]    |
Dec 19 20:42:15.200 INFO [stderr] 33 |     retry: bool,
Dec 19 20:42:15.200 INFO [stderr]    |     ^^^^^^^^^^^
Dec 19 20:42:15.200 INFO [stderr]    |
Dec 19 20:42:15.200 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 19 20:42:15.200 INFO [stderr] 
Dec 19 20:42:15.551 INFO [stderr]     Checking l4c v0.0.0 (/opt/crater/workdir)
Dec 19 20:42:17.888 INFO [stderr] warning: unused import: `Display`
Dec 19 20:42:17.888 INFO [stderr]  --> src/front/pp.rs:1:16
Dec 19 20:42:17.888 INFO [stderr]   |
Dec 19 20:42:17.888 INFO [stderr] 1 | use std::fmt::{Display, Write};
Dec 19 20:42:17.888 INFO [stderr]   |                ^^^^^^^
Dec 19 20:42:17.888 INFO [stderr]   |
Dec 19 20:42:17.888 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 20:42:17.888 INFO [stderr] 
Dec 19 20:42:17.961 INFO [stderr] warning: unused import: `Display`
Dec 19 20:42:17.961 INFO [stderr]  --> src/front/pp.rs:1:16
Dec 19 20:42:17.962 INFO [stderr]   |
Dec 19 20:42:17.962 INFO [stderr] 1 | use std::fmt::{Display, Write};
Dec 19 20:42:17.962 INFO [stderr]   |                ^^^^^^^
Dec 19 20:42:17.962 INFO [stderr]   |
Dec 19 20:42:17.962 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 20:42:17.963 INFO [stderr] 
Dec 19 20:42:19.461 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.23s
Dec 19 20:42:19.838 INFO running `"docker" "inspect" "04691f29561cdf09b078de8c8395d8adb333d31fad72e6d33c278ce2d827388e"`
Dec 19 20:42:19.946 INFO running `"docker" "rm" "-f" "04691f29561cdf09b078de8c8395d8adb333d31fad72e6d33c278ce2d827388e"`
Dec 19 20:42:20.093 INFO [stdout] 04691f29561cdf09b078de8c8395d8adb333d31fad72e6d33c278ce2d827388e