[INFO] crate buffoon 0.5.0 is already in cache
[INFO] extracting crate buffoon 0.5.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/buffoon/0.5.0
[INFO] extracting crate buffoon 0.5.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/buffoon/0.5.0
[INFO] validating manifest of buffoon-0.5.0 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 buffoon-0.5.0 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 buffoon-0.5.0
[INFO] finished frobbing buffoon-0.5.0
[INFO] frobbed toml for buffoon-0.5.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/buffoon/0.5.0/Cargo.toml
[INFO] started frobbing buffoon-0.5.0
[INFO] finished frobbing buffoon-0.5.0
[INFO] frobbed toml for buffoon-0.5.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/buffoon/0.5.0/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing buffoon-0.5.0 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/buffoon/0.5.0:/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] 88fee1922732c4771692fbb3c80bc9a67c4d8f7640863f0981cbedcfe0eed40a
[INFO] running `"docker" "start" "-a" "88fee1922732c4771692fbb3c80bc9a67c4d8f7640863f0981cbedcfe0eed40a"`
[INFO] [stderr]    Compiling buffoon v0.5.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/input_stream.rs:104:17
[INFO] [stderr]     |
[INFO] [stderr] 104 |             let mut buf = slice::from_raw_parts_mut(ret.as_mut_ptr(), len);
[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 0.40s
[INFO] running `"docker" "inspect" "88fee1922732c4771692fbb3c80bc9a67c4d8f7640863f0981cbedcfe0eed40a"`
[INFO] running `"docker" "rm" "-f" "88fee1922732c4771692fbb3c80bc9a67c4d8f7640863f0981cbedcfe0eed40a"`
[INFO] [stdout] 88fee1922732c4771692fbb3c80bc9a67c4d8f7640863f0981cbedcfe0eed40a
[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/buffoon/0.5.0:/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] ba387bb890fcbe06d320b02f0259fddc70c4514db729636c228c24195542f396
[INFO] running `"docker" "start" "-a" "ba387bb890fcbe06d320b02f0259fddc70c4514db729636c228c24195542f396"`
[INFO] [stderr]    Compiling buffoon v0.5.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/input_stream.rs:104:17
[INFO] [stderr]     |
[INFO] [stderr] 104 |             let mut buf = slice::from_raw_parts_mut(ret.as_mut_ptr(), len);
[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 1.25s
[INFO] running `"docker" "inspect" "ba387bb890fcbe06d320b02f0259fddc70c4514db729636c228c24195542f396"`
[INFO] running `"docker" "rm" "-f" "ba387bb890fcbe06d320b02f0259fddc70c4514db729636c228c24195542f396"`
[INFO] [stdout] ba387bb890fcbe06d320b02f0259fddc70c4514db729636c228c24195542f396
[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/buffoon/0.5.0:/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] dc14faf0055c42854ee6907b45f36232bff8aa75285522fba5d55839495907f4
[INFO] running `"docker" "start" "-a" "dc14faf0055c42854ee6907b45f36232bff8aa75285522fba5d55839495907f4"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/buffoon-46447499e62df1ab
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test input_stream::test::test_reading_twice_from_field ... ok
[INFO] [stdout] test input_stream::test::test_reading_string ... ok
[INFO] [stdout] test input_stream::test::test_reading_single_byte_usize ... ok
[INFO] [stdout] test input_stream::test::test_reading_empty_stream ... ok
[INFO] [stdout] test input_stream::test::test_skipping_string_field ... ok
[INFO] [stdout] test test::test_writing_simple_message ... ok
[INFO] [stdout] test input_stream::test::test_reading_multi_byte_usize ... ok
[INFO] [stdout] test input_stream::test::test_reading_sequential_fields ... ok
[INFO] [stdout] test test::test_writing_unit_struct ... ok
[INFO] [stderr]    Doc-tests buffoon
[INFO] [stdout] test input_stream::test::test_reading_incorrect_type_from_field ... ok
[INFO] [stdout] test input_stream::test::test_reading_multi_byte_tag_field ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[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" "dc14faf0055c42854ee6907b45f36232bff8aa75285522fba5d55839495907f4"`
[INFO] running `"docker" "rm" "-f" "dc14faf0055c42854ee6907b45f36232bff8aa75285522fba5d55839495907f4"`
[INFO] [stdout] dc14faf0055c42854ee6907b45f36232bff8aa75285522fba5d55839495907f4