[INFO] updating cached repository nathanfaucett/rs-gc
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/nathanfaucett/rs-gc
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/nathanfaucett/rs-gc" "work/ex/beta-1.38-1/sources/1.37.0/gh/nathanfaucett/rs-gc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/nathanfaucett/rs-gc'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/nathanfaucett/rs-gc" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nathanfaucett/rs-gc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nathanfaucett/rs-gc'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 869df00986fb7fee9cc8d06b7cb743ff7512cc5b
[INFO] sha for GitHub repo nathanfaucett/rs-gc: 869df00986fb7fee9cc8d06b7cb743ff7512cc5b
[INFO] validating manifest of nathanfaucett/rs-gc on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of nathanfaucett/rs-gc on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing nathanfaucett/rs-gc
[INFO] finished frobbing nathanfaucett/rs-gc
[INFO] frobbed toml for nathanfaucett/rs-gc written to work/ex/beta-1.38-1/sources/1.37.0/gh/nathanfaucett/rs-gc/Cargo.toml
[INFO] started frobbing nathanfaucett/rs-gc
[INFO] finished frobbing nathanfaucett/rs-gc
[INFO] frobbed toml for nathanfaucett/rs-gc written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/nathanfaucett/rs-gc/Cargo.toml
[INFO] crate nathanfaucett/rs-gc already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing nathanfaucett/rs-gc against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/nathanfaucett/rs-gc:/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=warn" "-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 657db18a2b0483a289cace45a791d1a51c9009406bbd9fa158c00485f446b9ed
[INFO] running `"docker" "start" "-a" "657db18a2b0483a289cace45a791d1a51c9009406bbd9fa158c00485f446b9ed"`
[INFO] [stderr]    Compiling gc v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0463]: can't find crate for `collections`
[INFO] [stderr]   --> src/lib.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | extern crate collections;
[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 `gc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "657db18a2b0483a289cace45a791d1a51c9009406bbd9fa158c00485f446b9ed"`
[INFO] running `"docker" "rm" "-f" "657db18a2b0483a289cace45a791d1a51c9009406bbd9fa158c00485f446b9ed"`
[INFO] [stdout] 657db18a2b0483a289cace45a791d1a51c9009406bbd9fa158c00485f446b9ed