[INFO] crate thread_io 0.2.0 is already in cache
[INFO] extracting crate thread_io 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/thread_io/0.2.0
[INFO] extracting crate thread_io 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/thread_io/0.2.0
[INFO] validating manifest of thread_io-0.2.0 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 thread_io-0.2.0 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 thread_io-0.2.0
[INFO] finished frobbing thread_io-0.2.0
[INFO] frobbed toml for thread_io-0.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/thread_io/0.2.0/Cargo.toml
[INFO] started frobbing thread_io-0.2.0
[INFO] finished frobbing thread_io-0.2.0
[INFO] frobbed toml for thread_io-0.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/thread_io/0.2.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 thread_io-0.2.0 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/thread_io/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 42bb0bd4f3cddc86cea30f22d1c40479b26d1abe6f86f27a8d2a6cab69bf964e
[INFO] running `"docker" "start" "-a" "42bb0bd4f3cddc86cea30f22d1c40479b26d1abe6f86f27a8d2a6cab69bf964e"`
[INFO] [stderr]    Compiling crossbeam-channel v0.3.9
[INFO] [stderr]    Compiling crossbeam v0.6.0
[INFO] [stderr]    Compiling thread_io v0.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.86s
[INFO] running `"docker" "inspect" "42bb0bd4f3cddc86cea30f22d1c40479b26d1abe6f86f27a8d2a6cab69bf964e"`
[INFO] running `"docker" "rm" "-f" "42bb0bd4f3cddc86cea30f22d1c40479b26d1abe6f86f27a8d2a6cab69bf964e"`
[INFO] [stdout] 42bb0bd4f3cddc86cea30f22d1c40479b26d1abe6f86f27a8d2a6cab69bf964e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/thread_io/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 39443b5e6eb4ba6cf5a853a15531628b64ca5a24c2bf32e63c65e3edb5232f8a
[INFO] running `"docker" "start" "-a" "39443b5e6eb4ba6cf5a853a15531628b64ca5a24c2bf32e63c65e3edb5232f8a"`
[INFO] [stderr]    Compiling thread_io v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/read.rs:64:25
[INFO] [stderr]    |
[INFO] [stderr] 64 |                     let mut rdr = Reader::new(text, rdr_block_size, ::std::usize::MAX);
[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] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/read.rs:68:25
[INFO] [stderr]    |
[INFO] [stderr] 68 |                     let mut rdr = Reader::new(text, rdr_block_size, ::std::usize::MAX);
[INFO] [stderr]    |                         ----^^^
[INFO] [stderr]    |                         |
[INFO] [stderr]    |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/read.rs:94:17
[INFO] [stderr]    |
[INFO] [stderr] 94 |             let mut rdr = Reader::new(text, channel_bufsize, len / channel_bufsize);
[INFO] [stderr]    |                 ----^^^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/write.rs:61:21
[INFO] [stderr]    |
[INFO] [stderr] 61 |                 let mut w = writer_init_finish(
[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 2.59s
[INFO] running `"docker" "inspect" "39443b5e6eb4ba6cf5a853a15531628b64ca5a24c2bf32e63c65e3edb5232f8a"`
[INFO] running `"docker" "rm" "-f" "39443b5e6eb4ba6cf5a853a15531628b64ca5a24c2bf32e63c65e3edb5232f8a"`
[INFO] [stdout] 39443b5e6eb4ba6cf5a853a15531628b64ca5a24c2bf32e63c65e3edb5232f8a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/thread_io/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 386a77a2235d31cc17af7daeb99a4dbe96fbca552214efe976541afda798923f
[INFO] running `"docker" "start" "-a" "386a77a2235d31cc17af7daeb99a4dbe96fbca552214efe976541afda798923f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/thread_io-1ce000c459a072bc
[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/read-bd455280d8198d1b
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test reader_init_fail ... ok
[INFO] [stdout] test read_fail ... ok
[INFO] [stdout] test read ... test read has been running for over 60 seconds
[INFO] [stdout] test read ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/write-b592c37cea09c64b
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test writer_init_fail ... ok
[INFO] [stdout] test write_fail ... test write_fail has been running for over 60 seconds
[INFO] [stdout] test write_thread ... test write_thread has been running for over 60 seconds
[INFO] [stdout] test write_fail ... ok
[INFO] [stdout] test write_thread ... ok
[INFO] [stderr]    Doc-tests thread_io
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 5 tests
[INFO] [stdout] test src/read.rs - read::reader_init (line 216) ... ok
[INFO] [stdout] test src/write.rs - write::writer_init (line 188) ... ok
[INFO] [stdout] test src/read.rs - read::reader (line 189) ... ok
[INFO] [stdout] test src/write.rs - write::writer_finish (line 226) ... ok
[INFO] [stdout] test src/write.rs - write::writer (line 161) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "386a77a2235d31cc17af7daeb99a4dbe96fbca552214efe976541afda798923f"`
[INFO] running `"docker" "rm" "-f" "386a77a2235d31cc17af7daeb99a4dbe96fbca552214efe976541afda798923f"`
[INFO] [stdout] 386a77a2235d31cc17af7daeb99a4dbe96fbca552214efe976541afda798923f