[INFO] crate crc32c 0.4.0 is already in cache
[INFO] extracting crate crc32c 0.4.0 into work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/crc32c/0.4.0
[INFO] extracting crate crc32c 0.4.0 into work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/crc32c/0.4.0
[INFO] validating manifest of crc32c-0.4.0 on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of crc32c-0.4.0 on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing crc32c-0.4.0
[INFO] finished frobbing crc32c-0.4.0
[INFO] frobbed toml for crc32c-0.4.0 written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/crc32c/0.4.0/Cargo.toml
[INFO] started frobbing crc32c-0.4.0
[INFO] finished frobbing crc32c-0.4.0
[INFO] frobbed toml for crc32c-0.4.0 written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/crc32c/0.4.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking crc32c-0.4.0 against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-1/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/crc32c/0.4.0:/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" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 47cd42a3f3ce4ea25d9b4012dc374cf1959eb922fcd681eb43ebe2b01da0110f
[INFO] running `"docker" "start" "-a" "47cd42a3f3ce4ea25d9b4012dc374cf1959eb922fcd681eb43ebe2b01da0110f"`
[INFO] [stderr]    Compiling crc32c v0.4.0 (/opt/crater/workdir)
[INFO] [stderr] warning: the item `mem` is imported redundantly
[INFO] [stderr]  --> build.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::{mem, ops};
[INFO] [stderr]   |           --- the item `mem` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 8 |     use std::mem;
[INFO] [stderr]   |         ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.48s
[INFO] running `"docker" "inspect" "47cd42a3f3ce4ea25d9b4012dc374cf1959eb922fcd681eb43ebe2b01da0110f"`
[INFO] running `"docker" "rm" "-f" "47cd42a3f3ce4ea25d9b4012dc374cf1959eb922fcd681eb43ebe2b01da0110f"`
[INFO] [stdout] 47cd42a3f3ce4ea25d9b4012dc374cf1959eb922fcd681eb43ebe2b01da0110f