[INFO] cloning repository https://github.com/felipesere/fern
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/felipesere/fern" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelipesere%2Ffern", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelipesere%2Ffern'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ba839cea42e159ddb23750b27237aee697fd7662
[INFO] checking felipesere/fern against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelipesere%2Ffern" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/felipesere/fern 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/felipesere/fern
[INFO] finished tweaking git repo https://github.com/felipesere/fern
[INFO] tweaked toml for git repo https://github.com/felipesere/fern written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/felipesere/fern 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 termtree v0.2.3
[INFO] [stderr]   Downloaded predicates-tree v1.0.4
[INFO] [stderr]   Downloaded assert_cmd v2.0.2
[INFO] [stderr]   Downloaded assert_fs v1.0.6
[INFO] [stderr]   Downloaded predicates v2.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] a6a86faee9ebbfe96e78a536febe50ed42a43ef54c4916a866497e3223091364
[INFO] running `Command { std: "docker" "start" "-a" "a6a86faee9ebbfe96e78a536febe50ed42a43ef54c4916a866497e3223091364", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a6a86faee9ebbfe96e78a536febe50ed42a43ef54c4916a866497e3223091364", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6a86faee9ebbfe96e78a536febe50ed42a43ef54c4916a866497e3223091364", kill_on_drop: false }`
[INFO] [stdout] a6a86faee9ebbfe96e78a536febe50ed42a43ef54c4916a866497e3223091364
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 78fd2b99dde2119a204723c8da935534bf85a72dd756d8884457dd3dd6759617
[INFO] running `Command { std: "docker" "start" "-a" "78fd2b99dde2119a204723c8da935534bf85a72dd756d8884457dd3dd6759617", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking predicates-core v1.0.2
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]    Compiling anyhow v1.0.48
[INFO] [stderr]     Checking termtree v0.2.3
[INFO] [stderr]     Checking normalize-line-endings v0.3.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking dtoa v0.4.8
[INFO] [stderr]     Checking predicates-tree v1.0.4
[INFO] [stderr]     Checking pico-args v0.4.2
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking float-cmp v0.9.0
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking dirs v4.0.0
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]     Checking globset v0.4.8
[INFO] [stderr]     Checking predicates v2.1.0
[INFO] [stderr]     Checking ignore v0.4.18
[INFO] [stderr]     Checking assert_cmd v2.0.2
[INFO] [stderr]     Checking globwalk v0.8.1
[INFO] [stderr]     Checking assert_fs v1.0.6
[INFO] [stderr]     Checking serde_yaml v0.8.21
[INFO] [stderr]     Checking fern-run v0.0.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 17.01s
[INFO] running `Command { std: "docker" "inspect" "78fd2b99dde2119a204723c8da935534bf85a72dd756d8884457dd3dd6759617", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78fd2b99dde2119a204723c8da935534bf85a72dd756d8884457dd3dd6759617", kill_on_drop: false }`
[INFO] [stdout] 78fd2b99dde2119a204723c8da935534bf85a72dd756d8884457dd3dd6759617
[INFO] checking felipesere/fern against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffelipesere%2Ffern" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/felipesere/fern 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/felipesere/fern
[INFO] finished tweaking git repo https://github.com/felipesere/fern
[INFO] tweaked toml for git repo https://github.com/felipesere/fern written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/felipesere/fern 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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 2cbbb13d733d70c20394699e9c7072dc8e1a7857a4b7b863660c00b1b23bb1a0
[INFO] running `Command { std: "docker" "start" "-a" "2cbbb13d733d70c20394699e9c7072dc8e1a7857a4b7b863660c00b1b23bb1a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2cbbb13d733d70c20394699e9c7072dc8e1a7857a4b7b863660c00b1b23bb1a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2cbbb13d733d70c20394699e9c7072dc8e1a7857a4b7b863660c00b1b23bb1a0", kill_on_drop: false }`
[INFO] [stdout] 2cbbb13d733d70c20394699e9c7072dc8e1a7857a4b7b863660c00b1b23bb1a0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] c62226f278be9db0a2f6d6e055be7645bffb3d0565e35ba194e57209feedbedc
[INFO] running `Command { std: "docker" "start" "-a" "c62226f278be9db0a2f6d6e055be7645bffb3d0565e35ba194e57209feedbedc", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking predicates-core v1.0.2
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling doc-comment v0.3.3
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking normalize-line-endings v0.3.0
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking difflib v0.4.0
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]    Compiling anyhow v1.0.48
[INFO] [stderr]     Checking termtree v0.2.3
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking dtoa v0.4.8
[INFO] [stderr]     Checking predicates-tree v1.0.4
[INFO] [stderr]     Checking pico-args v0.4.2
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking dirs v4.0.0
[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 float-cmp v0.9.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]     Checking globset v0.4.8
[INFO] [stderr]     Checking predicates v2.1.0
[INFO] [stderr]     Checking ignore v0.4.18
[INFO] [stderr]     Checking assert_cmd v2.0.2
[INFO] [stderr]     Checking globwalk v0.8.1
[INFO] [stderr]     Checking assert_fs v1.0.6
[INFO] [stderr]     Checking serde_yaml v0.8.21
[INFO] [stderr]     Checking fern-run v0.0.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.56s
[INFO] running `Command { std: "docker" "inspect" "c62226f278be9db0a2f6d6e055be7645bffb3d0565e35ba194e57209feedbedc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c62226f278be9db0a2f6d6e055be7645bffb3d0565e35ba194e57209feedbedc", kill_on_drop: false }`
[INFO] [stdout] c62226f278be9db0a2f6d6e055be7645bffb3d0565e35ba194e57209feedbedc