[INFO] cloning repository GrahamClark/collections-exercises-rust
[INFO] running `"git" "clone" "--bare" "git://github.com/GrahamClark/collections-exercises-rust.git" "work/cache/sources/gh/GrahamClark/collections-exercises-rust"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/GrahamClark/collections-exercises-rust'...
[INFO] running `"git" "clone" "work/cache/sources/gh/GrahamClark/collections-exercises-rust" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/GrahamClark/collections-exercises-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/GrahamClark/collections-exercises-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/GrahamClark/collections-exercises-rust" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/GrahamClark/collections-exercises-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/GrahamClark/collections-exercises-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 07217f7bbfeea46e91534db8ae932919ea060e90
[INFO] sha for GitHub repo GrahamClark/collections-exercises-rust: 07217f7bbfeea46e91534db8ae932919ea060e90
[INFO] validating manifest of GrahamClark/collections-exercises-rust 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 GrahamClark/collections-exercises-rust 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 GrahamClark/collections-exercises-rust
[INFO] finished frobbing GrahamClark/collections-exercises-rust
[INFO] frobbed toml for GrahamClark/collections-exercises-rust written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/GrahamClark/collections-exercises-rust/Cargo.toml
[INFO] started frobbing GrahamClark/collections-exercises-rust
[INFO] finished frobbing GrahamClark/collections-exercises-rust
[INFO] frobbed toml for GrahamClark/collections-exercises-rust written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/GrahamClark/collections-exercises-rust/Cargo.toml
[INFO] crate GrahamClark/collections-exercises-rust 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing GrahamClark/collections-exercises-rust against try#e212b7d492c96d3837691ba29d32d5f468933fb8 for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-6/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/GrahamClark/collections-exercises-rust:/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" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "build" "--frozen"`
[INFO] [stdout] 73dea7bdb800d679ce5080f5a8df2f25557e2c50339b2e3c83857a3f63e505ce
[INFO] running `"docker" "start" "-a" "73dea7bdb800d679ce5080f5a8df2f25557e2c50339b2e3c83857a3f63e505ce"`
[INFO] [stderr]    Compiling collections_exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.45s
[INFO] running `"docker" "inspect" "73dea7bdb800d679ce5080f5a8df2f25557e2c50339b2e3c83857a3f63e505ce"`
[INFO] running `"docker" "rm" "-f" "73dea7bdb800d679ce5080f5a8df2f25557e2c50339b2e3c83857a3f63e505ce"`
[INFO] [stdout] 73dea7bdb800d679ce5080f5a8df2f25557e2c50339b2e3c83857a3f63e505ce
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-6/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/GrahamClark/collections-exercises-rust:/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" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] 673ad14c132d4484fd4997fba28dc37160e05076138d7990f99d70478bbd4f0f
[INFO] running `"docker" "start" "-a" "673ad14c132d4484fd4997fba28dc37160e05076138d7990f99d70478bbd4f0f"`
[INFO] [stderr]    Compiling collections_exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.68s
[INFO] running `"docker" "inspect" "673ad14c132d4484fd4997fba28dc37160e05076138d7990f99d70478bbd4f0f"`
[INFO] running `"docker" "rm" "-f" "673ad14c132d4484fd4997fba28dc37160e05076138d7990f99d70478bbd4f0f"`
[INFO] [stdout] 673ad14c132d4484fd4997fba28dc37160e05076138d7990f99d70478bbd4f0f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-6/try#e212b7d492c96d3837691ba29d32d5f468933fb8:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/GrahamClark/collections-exercises-rust:/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" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "test" "--frozen"`
[INFO] [stdout] 2808bdd36333b07b610b8ae91d6b39825ce7a733b059281736d76cfdcd96a68c
[INFO] running `"docker" "start" "-a" "2808bdd36333b07b610b8ae91d6b39825ce7a733b059281736d76cfdcd96a68c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/collections_exercises-f87ffcd1391e5e24
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/collections_exercises-9cab02dccd0c3310
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests collections_exercises
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "2808bdd36333b07b610b8ae91d6b39825ce7a733b059281736d76cfdcd96a68c"`
[INFO] running `"docker" "rm" "-f" "2808bdd36333b07b610b8ae91d6b39825ce7a733b059281736d76cfdcd96a68c"`
[INFO] [stdout] 2808bdd36333b07b610b8ae91d6b39825ce7a733b059281736d76cfdcd96a68c