[INFO] cloning repository https://github.com/jgallagher/rustc-varargs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jgallagher/rustc-varargs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjgallagher%2Frustc-varargs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjgallagher%2Frustc-varargs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1c8312bc63613ff86b6f1c7517c68d9163b095b0
[INFO] testing jgallagher/rustc-varargs against master#b70888601af92f6cdc0364abab3446e418b91d36 for pr-86479
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjgallagher%2Frustc-varargs" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jgallagher/rustc-varargs on toolchain b70888601af92f6cdc0364abab3446e418b91d36
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jgallagher/rustc-varargs
[INFO] finished tweaking git repo https://github.com/jgallagher/rustc-varargs
[INFO] tweaked toml for git repo https://github.com/jgallagher/rustc-varargs written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/jgallagher/rustc-varargs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2036bb680e6e90c9292f867f1a2fbb2f85c2d50e1d333c22026b081e005eff8a
[INFO] running `Command { std: "docker" "start" "-a" "2036bb680e6e90c9292f867f1a2fbb2f85c2d50e1d333c22026b081e005eff8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2036bb680e6e90c9292f867f1a2fbb2f85c2d50e1d333c22026b081e005eff8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2036bb680e6e90c9292f867f1a2fbb2f85c2d50e1d333c22026b081e005eff8a", kill_on_drop: false }`
[INFO] [stdout] 2036bb680e6e90c9292f867f1a2fbb2f85c2d50e1d333c22026b081e005eff8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0b6423378b8d11d695207a802987a7397221a60135733efb224f0086ff9769b7
[INFO] running `Command { std: "docker" "start" "-a" "0b6423378b8d11d695207a802987a7397221a60135733efb224f0086ff9769b7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling gcc v0.3.26
[INFO] [stderr]    Compiling varargs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0617]: can't pass `extern "C" fn() {callback}` to variadic function
[INFO] [stdout]   --> src/main.rs:11:24
[INFO] [stdout]    |
[INFO] [stdout] 11 |     unsafe { foobar(1, callback, 3u64); }
[INFO] [stdout]    |                        ^^^^^^^^ help: cast the value to `extern "C" fn()`: `callback as extern "C" fn()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0617`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `varargs` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "0b6423378b8d11d695207a802987a7397221a60135733efb224f0086ff9769b7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b6423378b8d11d695207a802987a7397221a60135733efb224f0086ff9769b7", kill_on_drop: false }`
[INFO] [stdout] 0b6423378b8d11d695207a802987a7397221a60135733efb224f0086ff9769b7