[INFO] cloning repository https://github.com/rust-lang/thanks
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rust-lang/thanks" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-lang%2Fthanks", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-lang%2Fthanks'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 137b80e8bb2a60943712627c780ee0c550878117
[INFO] checking rust-lang/thanks against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-lang%2Fthanks" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rust-lang/thanks 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/rust-lang/thanks
[INFO] finished tweaking git repo https://github.com/rust-lang/thanks
[INFO] tweaked toml for git repo https://github.com/rust-lang/thanks written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rust-lang/thanks 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded handlebars v4.1.1
[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] fa3e0e838773673b9420315e064c4321cba91feb8fd2466291b711d19f212aff
[INFO] running `Command { std: "docker" "start" "-a" "fa3e0e838773673b9420315e064c4321cba91feb8fd2466291b711d19f212aff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fa3e0e838773673b9420315e064c4321cba91feb8fd2466291b711d19f212aff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa3e0e838773673b9420315e064c4321cba91feb8fd2466291b711d19f212aff", kill_on_drop: false }`
[INFO] [stdout] fa3e0e838773673b9420315e064c4321cba91feb8fd2466291b711d19f212aff
[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] 39ecb7bf1029099ddc3f12db448193e961c183243814f31a45094528cb72278f
[INFO] running `Command { std: "docker" "start" "-a" "39ecb7bf1029099ddc3f12db448193e961c183243814f31a45094528cb72278f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]     Checking tinyvec v1.3.1
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]     Checking form_urlencoded v1.0.1
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking openssl-probe v0.1.4
[INFO] [stderr]     Checking quick-error v2.0.1
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking mailmap v0.1.0 (/opt/rustwide/workdir/mailmap)
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking unicode-normalization v0.1.19
[INFO] [stderr]    Compiling jobserver v0.1.22
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking idna v0.2.3
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling openssl-sys v0.9.65
[INFO] [stderr]    Compiling libz-sys v1.1.3
[INFO] [stderr]    Compiling libssh2-sys v0.2.21
[INFO] [stderr]    Compiling libgit2-sys v0.12.21+1.1.0
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]     Checking url v2.2.2
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking git2 v0.13.20
[INFO] [stderr]     Checking handlebars v4.1.1
[INFO] [stderr]     Checking thanks v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `path` is never read
[INFO] [stdout]    --> src/main.rs:599:5
[INFO] [stdout]     |
[INFO] [stdout] 598 | struct Submodule {
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] 599 |     path: PathBuf,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Submodule` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/main.rs:592:9
[INFO] [stdout]     |
[INFO] [stdout] 592 |         std::mem::drop(cur);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^---^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&dyn StdError`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `path` is never read
[INFO] [stdout]    --> src/main.rs:599:5
[INFO] [stdout]     |
[INFO] [stdout] 598 | struct Submodule {
[INFO] [stdout]     |        --------- field in this struct
[INFO] [stdout] 599 |     path: PathBuf,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Submodule` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/main.rs:592:9
[INFO] [stdout]     |
[INFO] [stdout] 592 |         std::mem::drop(cur);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^---^
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        argument has type `&dyn StdError`
[INFO] [stdout]     |
[INFO] [stdout]     = note: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 24.81s
[INFO] running `Command { std: "docker" "inspect" "39ecb7bf1029099ddc3f12db448193e961c183243814f31a45094528cb72278f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39ecb7bf1029099ddc3f12db448193e961c183243814f31a45094528cb72278f", kill_on_drop: false }`
[INFO] [stdout] 39ecb7bf1029099ddc3f12db448193e961c183243814f31a45094528cb72278f