[INFO] fetching crate qbar 0.0.0...
[INFO] checking qbar-0.0.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate qbar 0.0.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate qbar 0.0.0 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 qbar 0.0.0
[INFO] finished tweaking crates.io crate qbar 0.0.0
[INFO] tweaked toml for crates.io crate qbar 0.0.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate qbar 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded arc-swap v0.4.7
[INFO] [stderr]   Downloaded net2 v0.2.35
[INFO] [stderr]   Downloaded signal-hook v0.1.16
[INFO] [stderr]   Downloaded signal-hook-registry v1.2.1
[INFO] [stderr]   Downloaded terminal v0.2.1
[INFO] [stderr]   Downloaded crossterm_winapi v0.6.1
[INFO] [stderr]   Downloaded smallvec v1.4.2
[INFO] [stderr]   Downloaded parking_lot_core v0.7.2
[INFO] [stderr]   Downloaded libc v0.2.77
[INFO] [stderr]   Downloaded mio v0.6.22
[INFO] [stderr]   Downloaded crossterm v0.15.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 8c03835660f01a6e18ec00464d23442d0f722008f20d2d85fe67147e3aec675d
[INFO] running `Command { std: "docker" "start" "-a" "8c03835660f01a6e18ec00464d23442d0f722008f20d2d85fe67147e3aec675d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c03835660f01a6e18ec00464d23442d0f722008f20d2d85fe67147e3aec675d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c03835660f01a6e18ec00464d23442d0f722008f20d2d85fe67147e3aec675d", kill_on_drop: false }`
[INFO] [stdout] 8c03835660f01a6e18ec00464d23442d0f722008f20d2d85fe67147e3aec675d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] dcffced17cddccdf5ad5a1758aaf51c0e95a93478a0add9d454ac10682708f2c
[INFO] running `Command { std: "docker" "start" "-a" "dcffced17cddccdf5ad5a1758aaf51c0e95a93478a0add9d454ac10682708f2c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking arc-swap v0.4.7
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.35
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking crossterm v0.15.0
[INFO] [stderr]     Checking terminal v0.2.1
[INFO] [stderr]     Checking qbar v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.70s
[INFO] running `Command { std: "docker" "inspect" "dcffced17cddccdf5ad5a1758aaf51c0e95a93478a0add9d454ac10682708f2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcffced17cddccdf5ad5a1758aaf51c0e95a93478a0add9d454ac10682708f2c", kill_on_drop: false }`
[INFO] [stdout] dcffced17cddccdf5ad5a1758aaf51c0e95a93478a0add9d454ac10682708f2c
[INFO] checking qbar-0.0.0 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate qbar 0.0.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate qbar 0.0.0 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 qbar 0.0.0
[INFO] finished tweaking crates.io crate qbar 0.0.0
[INFO] tweaked toml for crates.io crate qbar 0.0.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate crates.io crate qbar 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "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-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 68e1a86472fea3b4383506760eaed6269c1cef3db36b1c360099fac914630a19
[INFO] running `Command { std: "docker" "start" "-a" "68e1a86472fea3b4383506760eaed6269c1cef3db36b1c360099fac914630a19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "68e1a86472fea3b4383506760eaed6269c1cef3db36b1c360099fac914630a19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68e1a86472fea3b4383506760eaed6269c1cef3db36b1c360099fac914630a19", kill_on_drop: false }`
[INFO] [stdout] 68e1a86472fea3b4383506760eaed6269c1cef3db36b1c360099fac914630a19
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 539baa491839a9037ff7061decca3806f5685679af76eb771249f168880d3d8d
[INFO] running `Command { std: "docker" "start" "-a" "539baa491839a9037ff7061decca3806f5685679af76eb771249f168880d3d8d", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.77
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking arc-swap v0.4.7
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.35
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking signal-hook v0.1.16
[INFO] [stderr]     Checking crossterm v0.15.0
[INFO] [stderr]     Checking terminal v0.2.1
[INFO] [stderr]     Checking qbar v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.54s
[INFO] running `Command { std: "docker" "inspect" "539baa491839a9037ff7061decca3806f5685679af76eb771249f168880d3d8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "539baa491839a9037ff7061decca3806f5685679af76eb771249f168880d3d8d", kill_on_drop: false }`
[INFO] [stdout] 539baa491839a9037ff7061decca3806f5685679af76eb771249f168880d3d8d