[INFO] crate rtee 0.2.0 is already in cache
[INFO] extracting crate rtee 0.2.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/rtee/0.2.0
[INFO] extracting crate rtee 0.2.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rtee/0.2.0
[INFO] validating manifest of rtee-0.2.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rtee-0.2.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rtee-0.2.0
[INFO] finished frobbing rtee-0.2.0
[INFO] frobbed toml for rtee-0.2.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/rtee/0.2.0/Cargo.toml
[INFO] started frobbing rtee-0.2.0
[INFO] finished frobbing rtee-0.2.0
[INFO] frobbed toml for rtee-0.2.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rtee/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rtee-0.2.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/rtee/0.2.0:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 11ba17da494391894f4a11c8d92051857f5c78703578bc406aaa394cffd4f52c
[INFO] running `"docker" "start" "-a" "11ba17da494391894f4a11c8d92051857f5c78703578bc406aaa394cffd4f52c"`
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling unicode-width v0.1.5
[INFO] [stderr]    Compiling nix v0.10.0
[INFO] [stderr]    Compiling vec_map v0.8.1
[INFO] [stderr]    Compiling strsim v0.7.0
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling textwrap v0.9.0
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling clap v2.31.2
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling rtee v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |             for mut writer in &mut writers {
[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 23.59s
[INFO] running `"docker" "inspect" "11ba17da494391894f4a11c8d92051857f5c78703578bc406aaa394cffd4f52c"`
[INFO] running `"docker" "rm" "-f" "11ba17da494391894f4a11c8d92051857f5c78703578bc406aaa394cffd4f52c"`
[INFO] [stdout] 11ba17da494391894f4a11c8d92051857f5c78703578bc406aaa394cffd4f52c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/rtee/0.2.0:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 671e7a9104826207a075f27bd3924438f68a068c1f7d72faf625f9769e27683b
[INFO] running `"docker" "start" "-a" "671e7a9104826207a075f27bd3924438f68a068c1f7d72faf625f9769e27683b"`
[INFO] [stderr]    Compiling rtee v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |             for mut writer in &mut writers {
[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 0.69s
[INFO] running `"docker" "inspect" "671e7a9104826207a075f27bd3924438f68a068c1f7d72faf625f9769e27683b"`
[INFO] running `"docker" "rm" "-f" "671e7a9104826207a075f27bd3924438f68a068c1f7d72faf625f9769e27683b"`
[INFO] [stdout] 671e7a9104826207a075f27bd3924438f68a068c1f7d72faf625f9769e27683b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/rtee/0.2.0:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 056d303997fbf17334b1de8a00637fccb2318b1cb9a7e4fadb4d477f470d843a
[INFO] running `"docker" "start" "-a" "056d303997fbf17334b1de8a00637fccb2318b1cb9a7e4fadb4d477f470d843a"`
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rtee-a1f5dd3b6e1d7c8a
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "056d303997fbf17334b1de8a00637fccb2318b1cb9a7e4fadb4d477f470d843a"`
[INFO] running `"docker" "rm" "-f" "056d303997fbf17334b1de8a00637fccb2318b1cb9a7e4fadb4d477f470d843a"`
[INFO] [stdout] 056d303997fbf17334b1de8a00637fccb2318b1cb9a7e4fadb4d477f470d843a