[INFO] fetching crate walrus 0.18.0...
[INFO] testing walrus-0.18.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate walrus 0.18.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate walrus 0.18.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate walrus 0.18.0
[INFO] finished tweaking crates.io crate walrus 0.18.0
[INFO] tweaked toml for crates.io crate walrus 0.18.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate walrus 0.18.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8a38ff768fd5a0bf7e6377e81068fbfe6917f547c4abdaf7359267c49c3dfcbd
[INFO] running `Command { std: "docker" "start" "-a" "8a38ff768fd5a0bf7e6377e81068fbfe6917f547c4abdaf7359267c49c3dfcbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8a38ff768fd5a0bf7e6377e81068fbfe6917f547c4abdaf7359267c49c3dfcbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a38ff768fd5a0bf7e6377e81068fbfe6917f547c4abdaf7359267c49c3dfcbd", kill_on_drop: false }`
[INFO] [stdout] 8a38ff768fd5a0bf7e6377e81068fbfe6917f547c4abdaf7359267c49c3dfcbd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6b20c54f3fca13f92fa9a3d103038f16bda591da0b2283db07b51ec739da601b
[INFO] running `Command { std: "docker" "start" "-a" "6b20c54f3fca13f92fa9a3d103038f16bda591da0b2283db07b51ec739da601b", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.34
[INFO] [stderr]    Compiling walrus-macro v0.18.0
[INFO] [stderr]    Compiling walrus v0.18.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.06s
[INFO] running `Command { std: "docker" "inspect" "6b20c54f3fca13f92fa9a3d103038f16bda591da0b2283db07b51ec739da601b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b20c54f3fca13f92fa9a3d103038f16bda591da0b2283db07b51ec739da601b", kill_on_drop: false }`
[INFO] [stdout] 6b20c54f3fca13f92fa9a3d103038f16bda591da0b2283db07b51ec739da601b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 77f31db987d4a70908d692d84d6eaa004460776eb112eb48cde268232f1704f1
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "77f31db987d4a70908d692d84d6eaa004460776eb112eb48cde268232f1704f1", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_cbor v0.11.1
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling bstr v0.2.13
[INFO] [stderr]    Compiling tinytemplate v1.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling criterion-plot v0.4.3
[INFO] [stderr]    Compiling csv v1.1.3
[INFO] [stderr]    Compiling criterion v0.3.3
[INFO] [stderr]    Compiling walrus v0.18.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 48.60s
[INFO] running `Command { std: "docker" "inspect" "77f31db987d4a70908d692d84d6eaa004460776eb112eb48cde268232f1704f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77f31db987d4a70908d692d84d6eaa004460776eb112eb48cde268232f1704f1", kill_on_drop: false }`
[INFO] [stdout] 77f31db987d4a70908d692d84d6eaa004460776eb112eb48cde268232f1704f1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 46ad44ee13763cc7be5757306513a9a768eb0e90457232b796a14b2f62072d57
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "46ad44ee13763cc7be5757306513a9a768eb0e90457232b796a14b2f62072d57", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.66s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/walrus-3daa1898effc934b
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests walrus
[INFO] [stdout] running 13 tests
[INFO] [stdout] test module::exports::tests::get_exported_func ... ok
[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::get_exported_table_should_return_none_for_unknown_table_id ... ok
[INFO] [stdout] test module::exports::tests::get_exported_table ... ok
[INFO] [stdout] test module::exports::tests::iter_mut_can_update_export_item ... 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_global_should_return_none_for_unknown_global_id ... ok
[INFO] [stdout] test module::exports::tests::get_exported_global ... 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::delete ... ok
[INFO] [stdout] test tombstone_arena::tests::can_delete ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 13 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[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) ... ok
[INFO] [stdout] test src/ir/traversals.rs - ir::traversals::dfs_in_order (line 33) ... 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::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::instr_seq (line 71) ... 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::loop_ (line 306) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::InstrSeqBuilder::if_else_at (line 436) ... 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::if_else (line 380) ... ok
[INFO] [stdout] test src/function_builder.rs - function_builder::FunctionBuilder::dangling_instr_seq (line 110) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 12 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "46ad44ee13763cc7be5757306513a9a768eb0e90457232b796a14b2f62072d57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46ad44ee13763cc7be5757306513a9a768eb0e90457232b796a14b2f62072d57", kill_on_drop: false }`
[INFO] [stdout] 46ad44ee13763cc7be5757306513a9a768eb0e90457232b796a14b2f62072d57