[INFO] fetching crate cargo-modules 0.4.4...
[INFO] extracting crate cargo-modules 0.4.4 into work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/cargo-modules/0.4.4
[INFO] extracting crate cargo-modules 0.4.4 into work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/cargo-modules/0.4.4
[INFO] validating manifest of cargo-modules-0.4.4 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 cargo-modules-0.4.4 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 cargo-modules-0.4.4
[INFO] finished frobbing cargo-modules-0.4.4
[INFO] frobbed toml for cargo-modules-0.4.4 written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/cargo-modules/0.4.4/Cargo.toml
[INFO] started frobbing cargo-modules-0.4.4
[INFO] finished frobbing cargo-modules-0.4.4
[INFO] frobbed toml for cargo-modules-0.4.4 written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/cargo-modules/0.4.4/Cargo.toml
[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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cargo-modules-0.4.4 against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-3/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/cargo-modules/0.4.4:/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] 2f0c6923bdcab020785f8db833483c78621ace2a7d38619fb7b70453b01dec13
[INFO] running `"docker" "start" "-a" "2f0c6923bdcab020785f8db833483c78621ace2a7d38619fb7b70453b01dec13"`
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling rustc-ap-graphviz v373.0.0
[INFO] [stderr]    Compiling winapi v0.3.7
[INFO] [stderr]    Compiling scoped-tls v0.1.2
[INFO] [stderr]    Compiling rustc-ap-rustc_target v373.0.0
[INFO] [stderr]    Compiling rustc-ap-syntax v373.0.0
[INFO] [stderr]    Compiling json v0.11.14
[INFO] [stderr]    Compiling ena v0.11.0
[INFO] [stderr]    Compiling lock_api v0.1.5
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling rustc-ap-rustc_cratesio_shim v373.0.0
[INFO] [stderr]    Compiling rustc-hash v1.0.1
[INFO] [stderr]    Compiling rustc-ap-serialize v373.0.0
[INFO] [stderr]    Compiling rustc-rayon-core v0.1.2
[INFO] [stderr]    Compiling structopt-derive v0.2.16
[INFO] [stderr]    Compiling winconsole v0.10.0
[INFO] [stderr]    Compiling colored v1.8.0
[INFO] [stderr]    Compiling rustc-rayon v0.1.2
[INFO] [stderr]    Compiling parking_lot v0.6.4
[INFO] [stderr]    Compiling structopt v0.2.16
[INFO] [stderr]    Compiling rustc-ap-rustc_data_structures v373.0.0
[INFO] [stderr]    Compiling rustc-ap-arena v373.0.0
[INFO] [stderr]    Compiling rustc-ap-syntax_pos v373.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_errors v373.0.0
[INFO] [stderr]    Compiling cargo-modules v0.4.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/builder.rs:184:17
[INFO] [stderr]     |
[INFO] [stderr] 184 |             let mut prefix = if use_tree.prefix.segments.is_empty() {
[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 1m 17s
[INFO] running `"docker" "inspect" "2f0c6923bdcab020785f8db833483c78621ace2a7d38619fb7b70453b01dec13"`
[INFO] running `"docker" "rm" "-f" "2f0c6923bdcab020785f8db833483c78621ace2a7d38619fb7b70453b01dec13"`
[INFO] [stdout] 2f0c6923bdcab020785f8db833483c78621ace2a7d38619fb7b70453b01dec13
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-3/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/cargo-modules/0.4.4:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 27491decb537c35b1446193a304bfbb36b459d30afa87dcc9d33581972947990
[INFO] running `"docker" "start" "-a" "27491decb537c35b1446193a304bfbb36b459d30afa87dcc9d33581972947990"`
[INFO] [stderr]    Compiling cargo-modules v0.4.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/builder.rs:184:17
[INFO] [stderr]     |
[INFO] [stderr] 184 |             let mut prefix = if use_tree.prefix.segments.is_empty() {
[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 1.44s
[INFO] running `"docker" "inspect" "27491decb537c35b1446193a304bfbb36b459d30afa87dcc9d33581972947990"`
[INFO] running `"docker" "rm" "-f" "27491decb537c35b1446193a304bfbb36b459d30afa87dcc9d33581972947990"`
[INFO] [stdout] 27491decb537c35b1446193a304bfbb36b459d30afa87dcc9d33581972947990
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-3/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/cargo-modules/0.4.4:/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" "test" "--frozen"`
[INFO] [stdout] 6fbd00349d126332c45810e8038099cf642cd9385540f713f9c31bdcc4d9faa4
[INFO] running `"docker" "start" "-a" "6fbd00349d126332c45810e8038099cf642cd9385540f713f9c31bdcc4d9faa4"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/cargo_modules-f4720dd4be6e964e
[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" "6fbd00349d126332c45810e8038099cf642cd9385540f713f9c31bdcc4d9faa4"`
[INFO] running `"docker" "rm" "-f" "6fbd00349d126332c45810e8038099cf642cd9385540f713f9c31bdcc4d9faa4"`
[INFO] [stdout] 6fbd00349d126332c45810e8038099cf642cd9385540f713f9c31bdcc4d9faa4