[INFO] fetching crate toolchain_find 0.4.0...
[INFO] checking toolchain_find-0.4.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate toolchain_find 0.4.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate toolchain_find 0.4.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate toolchain_find 0.4.0
[INFO] finished tweaking crates.io crate toolchain_find 0.4.0
[INFO] tweaked toml for crates.io crate toolchain_find 0.4.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate crates.io crate toolchain_find 0.4.0 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded same-file v1.0.4
[INFO] [stderr]   Downloaded winapi-util v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 78b31ce7963a168c24c9721492276ff6cd3bccef109b53a97e34ab8226eb587b
[INFO] running `Command { std: "docker" "start" "-a" "78b31ce7963a168c24c9721492276ff6cd3bccef109b53a97e34ab8226eb587b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "78b31ce7963a168c24c9721492276ff6cd3bccef109b53a97e34ab8226eb587b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78b31ce7963a168c24c9721492276ff6cd3bccef109b53a97e34ab8226eb587b", kill_on_drop: false }`
[INFO] [stdout] 78b31ce7963a168c24c9721492276ff6cd3bccef109b53a97e34ab8226eb587b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 63deede2116ef468bb53476708bf0d70c45731db06a4ea97d8b9b232d22428e5
[INFO] running `Command { std: "docker" "start" "-a" "63deede2116ef468bb53476708bf0d70c45731db06a4ea97d8b9b232d22428e5", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling semver v1.0.17
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking same-file v1.0.4
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]     Checking home v0.5.3
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking aho-corasick v1.0.1
[INFO] [stderr]     Checking regex v1.8.3
[INFO] [stderr]     Checking toolchain_find v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `toolchain_find` is imported redundantly
[INFO] [stdout]  --> tests/integration.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use toolchain_find;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^ the item `toolchain_find` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.30s
[INFO] running `Command { std: "docker" "inspect" "63deede2116ef468bb53476708bf0d70c45731db06a4ea97d8b9b232d22428e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63deede2116ef468bb53476708bf0d70c45731db06a4ea97d8b9b232d22428e5", kill_on_drop: false }`
[INFO] [stdout] 63deede2116ef468bb53476708bf0d70c45731db06a4ea97d8b9b232d22428e5
[INFO] checking toolchain_find-0.4.0 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate toolchain_find 0.4.0 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate toolchain_find 0.4.0 on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate toolchain_find 0.4.0
[INFO] finished tweaking crates.io crate toolchain_find 0.4.0
[INFO] tweaked toml for crates.io crate toolchain_find 0.4.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate crates.io crate toolchain_find 0.4.0 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 88683e5ac0e37d16b06e7f7d03b7353d6bd90700fd5aefda9b80bc70b543149d
[INFO] running `Command { std: "docker" "start" "-a" "88683e5ac0e37d16b06e7f7d03b7353d6bd90700fd5aefda9b80bc70b543149d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "88683e5ac0e37d16b06e7f7d03b7353d6bd90700fd5aefda9b80bc70b543149d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88683e5ac0e37d16b06e7f7d03b7353d6bd90700fd5aefda9b80bc70b543149d", kill_on_drop: false }`
[INFO] [stdout] 88683e5ac0e37d16b06e7f7d03b7353d6bd90700fd5aefda9b80bc70b543149d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a3553f224c61e8867c66ddc3f1d3608f35bf59309c75a3f71bb47b8efd01b8b1
[INFO] running `Command { std: "docker" "start" "-a" "a3553f224c61e8867c66ddc3f1d3608f35bf59309c75a3f71bb47b8efd01b8b1", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling semver v1.0.17
[INFO] [stderr]     Checking regex-syntax v0.7.2
[INFO] [stderr]     Checking same-file v1.0.4
[INFO] [stderr]     Checking home v0.5.3
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]     Checking walkdir v2.3.1
[INFO] [stderr]     Checking aho-corasick v1.0.1
[INFO] [stderr]     Checking regex v1.8.3
[INFO] [stderr]     Checking toolchain_find v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `toolchain_find` is imported redundantly
[INFO] [stdout]  --> tests/integration.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use toolchain_find;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^ the item `toolchain_find` is already defined by prelude
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.62s
[INFO] running `Command { std: "docker" "inspect" "a3553f224c61e8867c66ddc3f1d3608f35bf59309c75a3f71bb47b8efd01b8b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a3553f224c61e8867c66ddc3f1d3608f35bf59309c75a3f71bb47b8efd01b8b1", kill_on_drop: false }`
[INFO] [stdout] a3553f224c61e8867c66ddc3f1d3608f35bf59309c75a3f71bb47b8efd01b8b1