[INFO] cloning repository huonw/unsafe_ls
[INFO] running `"git" "clone" "--bare" "git://github.com/huonw/unsafe_ls.git" "work/cache/sources/gh/huonw/unsafe_ls"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/huonw/unsafe_ls'...
[INFO] running `"git" "clone" "work/cache/sources/gh/huonw/unsafe_ls" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/huonw/unsafe_ls"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/huonw/unsafe_ls'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/huonw/unsafe_ls" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/huonw/unsafe_ls"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/huonw/unsafe_ls'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 30df3f034d0f50dee82d24929ef8d12411708172
[INFO] sha for GitHub repo huonw/unsafe_ls: 30df3f034d0f50dee82d24929ef8d12411708172
[INFO] validating manifest of huonw/unsafe_ls on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of huonw/unsafe_ls on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing huonw/unsafe_ls
[INFO] finished frobbing huonw/unsafe_ls
[INFO] frobbed toml for huonw/unsafe_ls written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/huonw/unsafe_ls/Cargo.toml
[INFO] started frobbing huonw/unsafe_ls
[INFO] finished frobbing huonw/unsafe_ls
[INFO] frobbed toml for huonw/unsafe_ls written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/huonw/unsafe_ls/Cargo.toml
[INFO] crate huonw/unsafe_ls already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/huonw/unsafe_ls/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing huonw/unsafe_ls against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-6/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/huonw/unsafe_ls:/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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "build" "--frozen"`
[INFO] [stdout] c5692dd86f22f4ba3f2e8b08ec0749ede0013679bb45d6d0921c5ce833a28ca2
[INFO] running `"docker" "start" "-a" "c5692dd86f22f4ba3f2e8b08ec0749ede0013679bb45d6d0921c5ce833a28ca2"`
[INFO] [stderr] warning: path `/opt/crater/workdir/src/unsafe_ls.rs` was erroneously implicitly accepted for binary `unsafe_ls`,
[INFO] [stderr] please set bin.path in Cargo.toml
[INFO] [stderr]    Compiling getopts v0.2.19
[INFO] [stderr]    Compiling unsafe_ls v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0463]: can't find crate for `rustc_back`
[INFO] [stderr]  --> src/unsafe_ls.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | extern crate rustc_back;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: Could not compile `unsafe_ls`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c5692dd86f22f4ba3f2e8b08ec0749ede0013679bb45d6d0921c5ce833a28ca2"`
[INFO] running `"docker" "rm" "-f" "c5692dd86f22f4ba3f2e8b08ec0749ede0013679bb45d6d0921c5ce833a28ca2"`
[INFO] [stdout] c5692dd86f22f4ba3f2e8b08ec0749ede0013679bb45d6d0921c5ce833a28ca2