[INFO] fetching crate bootimage 0.7.5...
[INFO] extracting crate bootimage 0.7.5 into work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/reg/bootimage/0.7.5
[INFO] extracting crate bootimage 0.7.5 into work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/reg/bootimage/0.7.5
[INFO] validating manifest of bootimage-0.7.5 on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bootimage-0.7.5 on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing bootimage-0.7.5
[INFO] finished frobbing bootimage-0.7.5
[INFO] frobbed toml for bootimage-0.7.5 written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/reg/bootimage/0.7.5/Cargo.toml
[INFO] started frobbing bootimage-0.7.5
[INFO] finished frobbing bootimage-0.7.5
[INFO] frobbed toml for bootimage-0.7.5 written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/reg/bootimage/0.7.5/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking bootimage-0.7.5 against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-3/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/reg/bootimage/0.7.5:/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" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 67869f61bddeaa8c9a218c0b8e78f8042b3c6b6b8c3975b3e4dbee01449e7bd2
[INFO] running `"docker" "start" "-a" "67869f61bddeaa8c9a218c0b8e78f8042b3c6b6b8c3975b3e4dbee01449e7bd2"`
[INFO] [stderr]     Checking llvm-tools v0.1.1
[INFO] [stderr]     Checking locate-cargo-manifest v0.1.0
[INFO] [stderr]     Checking cargo_metadata v0.7.4
[INFO] [stderr]     Checking bootimage v0.7.5 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `File`
[INFO] [stderr]    --> src/builder.rs:303:27
[INFO] [stderr]     |
[INFO] [stderr] 303 |             use std::fs::{File, OpenOptions};
[INFO] [stderr]     |                           ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `File`
[INFO] [stderr]    --> src/builder.rs:303:27
[INFO] [stderr]     |
[INFO] [stderr] 303 |             use std::fs::{File, OpenOptions};
[INFO] [stderr]     |                           ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/builder.rs:304:17
[INFO] [stderr]     |
[INFO] [stderr] 304 |             let mut file = OpenOptions::new()
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/builder.rs:304:17
[INFO] [stderr]     |
[INFO] [stderr] 304 |             let mut file = OpenOptions::new()
[INFO] [stderr]     |                 ----^^^^
[INFO] [stderr]     |                 |
[INFO] [stderr]     |                 help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.46s
[INFO] running `"docker" "inspect" "67869f61bddeaa8c9a218c0b8e78f8042b3c6b6b8c3975b3e4dbee01449e7bd2"`
[INFO] running `"docker" "rm" "-f" "67869f61bddeaa8c9a218c0b8e78f8042b3c6b6b8c3975b3e4dbee01449e7bd2"`
[INFO] [stdout] 67869f61bddeaa8c9a218c0b8e78f8042b3c6b6b8c3975b3e4dbee01449e7bd2