[INFO] fetching crate twiggy-traits 0.7.0...
[INFO] testing twiggy-traits-0.7.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate twiggy-traits 0.7.0 into /workspace/builds/worker-38/source
[INFO] validating manifest of crates.io crate twiggy-traits 0.7.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate twiggy-traits 0.7.0
[INFO] finished tweaking crates.io crate twiggy-traits 0.7.0
[INFO] tweaked toml for crates.io crate twiggy-traits 0.7.0 written to /workspace/builds/worker-38/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 29167c43e419c83b7a5766431145b89efb6052ac3a78b0d92b6b5948eadf58a4
[INFO] running `Command { std: "docker" "start" "-a" "29167c43e419c83b7a5766431145b89efb6052ac3a78b0d92b6b5948eadf58a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "29167c43e419c83b7a5766431145b89efb6052ac3a78b0d92b6b5948eadf58a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29167c43e419c83b7a5766431145b89efb6052ac3a78b0d92b6b5948eadf58a4", kill_on_drop: false }`
[INFO] [stdout] 29167c43e419c83b7a5766431145b89efb6052ac3a78b0d92b6b5948eadf58a4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ecf68956284c764903240beccb19b6b2298f0ebda5689387ce0c5f6494597356
[INFO] running `Command { std: "docker" "start" "-a" "ecf68956284c764903240beccb19b6b2298f0ebda5689387ce0c5f6494597356", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling cc v1.0.70
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling cpp_demangle v0.3.3
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]    Compiling rustc-demangle v0.1.21
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling gimli v0.25.0
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling fixedbitset v0.4.0
[INFO] [stderr]    Compiling frozen v1.0.0
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]    Compiling wasmparser v0.35.3
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]    Compiling object v0.26.2
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling petgraph v0.6.0
[INFO] [stderr]    Compiling addr2line v0.16.0
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling twiggy-ir v0.7.0
[INFO] [stderr]    Compiling twiggy-traits v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `items`
[INFO] [stdout]    --> traits.rs:224:9
[INFO] [stdout]     |
[INFO] [stdout] 224 |         items: &ir::Items,
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_items`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `destination`
[INFO] [stdout]    --> traits.rs:225:9
[INFO] [stdout]     |
[INFO] [stdout] 225 |         destination: &mut dyn io::Write,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_destination`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 43.16s
[INFO] running `Command { std: "docker" "inspect" "ecf68956284c764903240beccb19b6b2298f0ebda5689387ce0c5f6494597356", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ecf68956284c764903240beccb19b6b2298f0ebda5689387ce0c5f6494597356", kill_on_drop: false }`
[INFO] [stdout] ecf68956284c764903240beccb19b6b2298f0ebda5689387ce0c5f6494597356
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 983d75fbf94d1114bd6f2f4711cc7b0e253b3e1fe1790d8cfc7f5434067a5a36
[INFO] running `Command { std: "docker" "start" "-a" "983d75fbf94d1114bd6f2f4711cc7b0e253b3e1fe1790d8cfc7f5434067a5a36", kill_on_drop: false }`
[INFO] [stderr]    Compiling twiggy-traits v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `items`
[INFO] [stdout]    --> traits.rs:224:9
[INFO] [stdout]     |
[INFO] [stdout] 224 |         items: &ir::Items,
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_items`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `destination`
[INFO] [stdout]    --> traits.rs:225:9
[INFO] [stdout]     |
[INFO] [stdout] 225 |         destination: &mut dyn io::Write,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_destination`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `items`
[INFO] [stdout]    --> traits.rs:224:9
[INFO] [stdout]     |
[INFO] [stdout] 224 |         items: &ir::Items,
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_items`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `destination`
[INFO] [stdout]    --> traits.rs:225:9
[INFO] [stdout]     |
[INFO] [stdout] 225 |         destination: &mut dyn io::Write,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_destination`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.47s
[INFO] running `Command { std: "docker" "inspect" "983d75fbf94d1114bd6f2f4711cc7b0e253b3e1fe1790d8cfc7f5434067a5a36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "983d75fbf94d1114bd6f2f4711cc7b0e253b3e1fe1790d8cfc7f5434067a5a36", kill_on_drop: false }`
[INFO] [stdout] 983d75fbf94d1114bd6f2f4711cc7b0e253b3e1fe1790d8cfc7f5434067a5a36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] e6bc9c4f36d862e7f8b67cabee915f54a4c3d97011e2ed34b1f720ff51b185f5
[INFO] running `Command { std: "docker" "start" "-a" "e6bc9c4f36d862e7f8b67cabee915f54a4c3d97011e2ed34b1f720ff51b185f5", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `items`
[INFO] [stderr]    --> traits.rs:224:9
[INFO] [stderr]     |
[INFO] [stderr] 224 |         items: &ir::Items,
[INFO] [stderr]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_items`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `destination`
[INFO] [stderr]    --> traits.rs:225:9
[INFO] [stderr]     |
[INFO] [stderr] 225 |         destination: &mut dyn io::Write,
[INFO] [stderr]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_destination`
[INFO] [stderr] 
[INFO] [stderr] warning: `twiggy-traits` (lib) generated 2 warnings
[INFO] [stderr] warning: `twiggy-traits` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/twiggy_traits-372ab84809a99822)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test size_of_error_is_one_word ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests twiggy-traits
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "e6bc9c4f36d862e7f8b67cabee915f54a4c3d97011e2ed34b1f720ff51b185f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6bc9c4f36d862e7f8b67cabee915f54a4c3d97011e2ed34b1f720ff51b185f5", kill_on_drop: false }`
[INFO] [stdout] e6bc9c4f36d862e7f8b67cabee915f54a4c3d97011e2ed34b1f720ff51b185f5