[INFO] fetching crate letter 0.0.0...
[INFO] testing letter-0.0.0 against try#dec9417b8611e34e787a3e4c37686b5131f9e5c5 for pr-154210-1
[INFO] extracting crate letter 0.0.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate letter 0.0.0
[INFO] finished tweaking crates.io crate letter 0.0.0
[INFO] tweaked toml for crates.io crate letter 0.0.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate letter 0.0.0 on toolchain dec9417b8611e34e787a3e4c37686b5131f9e5c5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate letter 0.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b48141b4a9e984549514f3e4acf90a30b755dfc217ac1993b3e71ea70419a1e3
[INFO] running `Command { std: "docker" "start" "-a" "b48141b4a9e984549514f3e4acf90a30b755dfc217ac1993b3e71ea70419a1e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b48141b4a9e984549514f3e4acf90a30b755dfc217ac1993b3e71ea70419a1e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b48141b4a9e984549514f3e4acf90a30b755dfc217ac1993b3e71ea70419a1e3", kill_on_drop: false }`
[INFO] [stdout] b48141b4a9e984549514f3e4acf90a30b755dfc217ac1993b3e71ea70419a1e3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 46ff69a98a191f408222a9522dbc691caa4f3aff5396440e12b2b4e8b4f3a664
[INFO] running `Command { std: "docker" "start" "-a" "46ff69a98a191f408222a9522dbc691caa4f3aff5396440e12b2b4e8b4f3a664", kill_on_drop: false }`
[INFO] [stderr]    Compiling letter v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.35s
[INFO] running `Command { std: "docker" "inspect" "46ff69a98a191f408222a9522dbc691caa4f3aff5396440e12b2b4e8b4f3a664", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46ff69a98a191f408222a9522dbc691caa4f3aff5396440e12b2b4e8b4f3a664", kill_on_drop: false }`
[INFO] [stdout] 46ff69a98a191f408222a9522dbc691caa4f3aff5396440e12b2b4e8b4f3a664
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84ab84b2bb4a4699dd38a5c954f5116b0d3dc64ba08b4723a9f455cd23fbf92b
[INFO] running `Command { std: "docker" "start" "-a" "84ab84b2bb4a4699dd38a5c954f5116b0d3dc64ba08b4723a9f455cd23fbf92b", kill_on_drop: false }`
[INFO] [stderr]    Compiling letter v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "84ab84b2bb4a4699dd38a5c954f5116b0d3dc64ba08b4723a9f455cd23fbf92b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84ab84b2bb4a4699dd38a5c954f5116b0d3dc64ba08b4723a9f455cd23fbf92b", kill_on_drop: false }`
[INFO] [stdout] 84ab84b2bb4a4699dd38a5c954f5116b0d3dc64ba08b4723a9f455cd23fbf92b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d1ec014a8a11bebe7695344a37840344fce0149f53706f3fe79f3ddf0536b8ef
[INFO] running `Command { std: "docker" "start" "-a" "d1ec014a8a11bebe7695344a37840344fce0149f53706f3fe79f3ddf0536b8ef", kill_on_drop: false }`
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/letter-5f354109e22871e1)
[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" "d1ec014a8a11bebe7695344a37840344fce0149f53706f3fe79f3ddf0536b8ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1ec014a8a11bebe7695344a37840344fce0149f53706f3fe79f3ddf0536b8ef", kill_on_drop: false }`
[INFO] [stdout] d1ec014a8a11bebe7695344a37840344fce0149f53706f3fe79f3ddf0536b8ef