[INFO] cloning repository https://github.com/fzyzcjy/experiment_backtrace
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fzyzcjy/experiment_backtrace" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffzyzcjy%2Fexperiment_backtrace", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffzyzcjy%2Fexperiment_backtrace'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4da22c72bb46fe9a28191c19be6392a15e22cd94
[INFO] checking fzyzcjy/experiment_backtrace against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffzyzcjy%2Fexperiment_backtrace" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fzyzcjy/experiment_backtrace 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 git repo https://github.com/fzyzcjy/experiment_backtrace
[INFO] finished tweaking git repo https://github.com/fzyzcjy/experiment_backtrace
[INFO] tweaked toml for git repo https://github.com/fzyzcjy/experiment_backtrace written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/fzyzcjy/experiment_backtrace 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 object v0.26.2
[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] 50e3d6a9e42a30e0ad9f3de05aae1de4ffc19e0a151d3f18e3011bc12fe10343
[INFO] running `Command { std: "docker" "start" "-a" "50e3d6a9e42a30e0ad9f3de05aae1de4ffc19e0a151d3f18e3011bc12fe10343", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "50e3d6a9e42a30e0ad9f3de05aae1de4ffc19e0a151d3f18e3011bc12fe10343", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50e3d6a9e42a30e0ad9f3de05aae1de4ffc19e0a151d3f18e3011bc12fe10343", kill_on_drop: false }`
[INFO] [stdout] 50e3d6a9e42a30e0ad9f3de05aae1de4ffc19e0a151d3f18e3011bc12fe10343
[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] b14ff76045d2569afa2a54590404e08fb8b9aff0110f49092a0c618e64310fc8
[INFO] running `Command { std: "docker" "start" "-a" "b14ff76045d2569afa2a54590404e08fb8b9aff0110f49092a0c618e64310fc8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling cc v1.0.71
[INFO] [stderr]     Checking gimli v0.25.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling anyhow v1.0.44
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]     Checking object v0.26.2
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking addr2line v0.16.0
[INFO] [stderr]     Checking experiment_backtrace v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.63s
[INFO] running `Command { std: "docker" "inspect" "b14ff76045d2569afa2a54590404e08fb8b9aff0110f49092a0c618e64310fc8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b14ff76045d2569afa2a54590404e08fb8b9aff0110f49092a0c618e64310fc8", kill_on_drop: false }`
[INFO] [stdout] b14ff76045d2569afa2a54590404e08fb8b9aff0110f49092a0c618e64310fc8
[INFO] checking fzyzcjy/experiment_backtrace against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffzyzcjy%2Fexperiment_backtrace" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fzyzcjy/experiment_backtrace 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 git repo https://github.com/fzyzcjy/experiment_backtrace
[INFO] finished tweaking git repo https://github.com/fzyzcjy/experiment_backtrace
[INFO] tweaked toml for git repo https://github.com/fzyzcjy/experiment_backtrace written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/fzyzcjy/experiment_backtrace 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] 997dcba8d252b755b0e82aa8aacd6f087c664012bb6959959384fec6fd81a8d4
[INFO] running `Command { std: "docker" "start" "-a" "997dcba8d252b755b0e82aa8aacd6f087c664012bb6959959384fec6fd81a8d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "997dcba8d252b755b0e82aa8aacd6f087c664012bb6959959384fec6fd81a8d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "997dcba8d252b755b0e82aa8aacd6f087c664012bb6959959384fec6fd81a8d4", kill_on_drop: false }`
[INFO] [stdout] 997dcba8d252b755b0e82aa8aacd6f087c664012bb6959959384fec6fd81a8d4
[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] 48b3e2dc05e631f1ca65e72f72e42a99ba93ff51f8761278d20a87513f8e74b4
[INFO] running `Command { std: "docker" "start" "-a" "48b3e2dc05e631f1ca65e72f72e42a99ba93ff51f8761278d20a87513f8e74b4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling cc v1.0.71
[INFO] [stderr]     Checking gimli v0.25.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling anyhow v1.0.44
[INFO] [stderr]     Checking rustc-demangle v0.1.21
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]     Checking object v0.26.2
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking addr2line v0.16.0
[INFO] [stderr]     Checking experiment_backtrace v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.89s
[INFO] running `Command { std: "docker" "inspect" "48b3e2dc05e631f1ca65e72f72e42a99ba93ff51f8761278d20a87513f8e74b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48b3e2dc05e631f1ca65e72f72e42a99ba93ff51f8761278d20a87513f8e74b4", kill_on_drop: false }`
[INFO] [stdout] 48b3e2dc05e631f1ca65e72f72e42a99ba93ff51f8761278d20a87513f8e74b4