[INFO] fetching crate walrus 0.19.0...
[INFO] testing walrus-0.19.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate walrus 0.19.0 into /workspace/builds/worker-100/source
[INFO] validating manifest of crates.io crate walrus 0.19.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate walrus 0.19.0
[INFO] finished tweaking crates.io crate walrus 0.19.0
[INFO] tweaked toml for crates.io crate walrus 0.19.0 written to /workspace/builds/worker-100/source/Cargo.toml
[INFO] crate crates.io crate walrus 0.19.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 17bb2f9abca3f43cec1a94ce6ce90f3d582c0b6ce252313220a421a497ea7a70
[INFO] running `Command { std: "docker" "start" "-a" "17bb2f9abca3f43cec1a94ce6ce90f3d582c0b6ce252313220a421a497ea7a70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "17bb2f9abca3f43cec1a94ce6ce90f3d582c0b6ce252313220a421a497ea7a70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17bb2f9abca3f43cec1a94ce6ce90f3d582c0b6ce252313220a421a497ea7a70", kill_on_drop: false }`
[INFO] [stdout] 17bb2f9abca3f43cec1a94ce6ce90f3d582c0b6ce252313220a421a497ea7a70
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 040d7d27dc0b3e82bd9c6fdd533b09fd8be2aada4c30413890163e247ac8d4dd
[INFO] running `Command { std: "docker" "start" "-a" "040d7d27dc0b3e82bd9c6fdd533b09fd8be2aada4c30413890163e247ac8d4dd", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.67
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling leb128 v0.2.4
[INFO] [stderr]    Compiling id-arena v2.2.1
[INFO] [stderr]    Compiling wasmparser v0.77.0
[INFO] [stderr]    Compiling heck v0.3.2
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling walrus-macro v0.19.0
[INFO] [stderr]    Compiling walrus v0.19.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.71s
[INFO] running `Command { std: "docker" "inspect" "040d7d27dc0b3e82bd9c6fdd533b09fd8be2aada4c30413890163e247ac8d4dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "040d7d27dc0b3e82bd9c6fdd533b09fd8be2aada4c30413890163e247ac8d4dd", kill_on_drop: false }`
[INFO] [stdout] 040d7d27dc0b3e82bd9c6fdd533b09fd8be2aada4c30413890163e247ac8d4dd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8868f9a37c600706183c9c0d531214ad353c4b24739c5d5af7009eca36bf58a9
[INFO] running `Command { std: "docker" "start" "-a" "8868f9a37c600706183c9c0d531214ad353c4b24739c5d5af7009eca36bf58a9", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]    Compiling libc v0.2.92
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling byteorder v1.4.3
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]    Compiling plotters-backend v0.3.0
[INFO] [stderr]    Compiling regex-syntax v0.6.23
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling half v1.7.1
[INFO] [stderr]    Compiling oorandom v11.1.3
[INFO] [stderr]    Compiling crossbeam-utils v0.8.3
[INFO] [stderr]    Compiling memoffset v0.6.3
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling walkdir v2.3.2
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling itertools v0.10.0
[INFO] [stderr]    Compiling regex-automata v0.1.9
[INFO] [stderr]    Compiling plotters-svg v0.3.0
[INFO] [stderr]    Compiling plotters v0.3.0
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling criterion-plot v0.4.3
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling regex v1.4.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.3
[INFO] [stderr]    Compiling crossbeam-channel v0.5.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling env_logger v0.8.3
[INFO] [stderr]    Compiling bstr v0.2.15
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling csv v1.1.6
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling criterion v0.3.4
[INFO] [stderr]    Compiling walrus v0.19.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 18.27s
[INFO] running `Command { std: "docker" "inspect" "8868f9a37c600706183c9c0d531214ad353c4b24739c5d5af7009eca36bf58a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8868f9a37c600706183c9c0d531214ad353c4b24739c5d5af7009eca36bf58a9", kill_on_drop: false }`
[INFO] [stdout] 8868f9a37c600706183c9c0d531214ad353c4b24739c5d5af7009eca36bf58a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-100/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" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] e116e45f4890bc63889ab9460983f7c745e10d601974243d0ca6c9d2d710e2b4
[INFO] running `Command { std: "docker" "start" "-a" "e116e45f4890bc63889ab9460983f7c745e10d601974243d0ca6c9d2d710e2b4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.14s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/walrus-f94ea0d1162ad4f0)
[INFO] [stdout] running 13 tests
[INFO] [stdout] test ir::traversals::tests::dfs_in_order ... ok
[INFO] [stdout] test ir::traversals::tests::dfs_pre_order_mut ... ok
[INFO] [stdout] test module::exports::tests::delete ... ok
[INFO] [stdout] test module::exports::tests::get_exported_global ... ok
[INFO] [stdout] test module::exports::tests::get_exported_memory_should_return_none_for_unknown_memory_id ... ok
[INFO] [stdout] test module::exports::tests::get_exported_table ... ok
[INFO] [stdout] test module::exports::tests::get_exported_func ... ok
[INFO] [stdout] test module::exports::tests::get_exported_global_should_return_none_for_unknown_global_id ... ok
[INFO] [stdout] test module::exports::tests::get_exported_func_should_return_none_for_unknown_function_id ... ok
[INFO] [stdout] test module::exports::tests::get_exported_memory ... ok
[INFO] [stdout] test module::exports::tests::get_exported_table_should_return_none_for_unknown_table_id ... ok
[INFO] [stderr]    Doc-tests walrus
[INFO] [stdout] test tombstone_arena::tests::can_delete ... ok
[INFO] [stdout] test module::exports::tests::iter_mut_can_update_export_item ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 14 tests
[INFO] [stdout] test src/ir/mod.rs - ir::Instr (line 222) ... ignored
[INFO] [stdout] test src/ir/mod.rs - ir::Instr (line 231) ... ignored
[INFO] [stdout] test src/ir/traversals.rs - ir::traversals::dfs_pre_order_mut (line 155) - compile ... ok
[INFO] [stdout] test src/ir/traversals.rs - ir::traversals::dfs_in_order (line 33) - compile ... ok
[INFO] [stdout] test src/dot.rs - dot::Module::write_graphviz_dot (line 17) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::InstrSeqBuilder::loop_at (line 340) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::InstrSeqBuilder::block_at (line 267) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::InstrSeqBuilder::loop_ (line 306) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::InstrSeqBuilder::block (line 234) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::FunctionBuilder::finish (line 141) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::FunctionBuilder::dangling_instr_seq (line 110) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::FunctionBuilder::instr_seq (line 71) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::InstrSeqBuilder::if_else (line 380) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::InstrSeqBuilder::if_else_at (line 436) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out; finished in 1.21s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "e116e45f4890bc63889ab9460983f7c745e10d601974243d0ca6c9d2d710e2b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e116e45f4890bc63889ab9460983f7c745e10d601974243d0ca6c9d2d710e2b4", kill_on_drop: false }`
[INFO] [stdout] e116e45f4890bc63889ab9460983f7c745e10d601974243d0ca6c9d2d710e2b4