[INFO] cloning repository https://github.com/dmichiels/RustFBP
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dmichiels/RustFBP" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdmichiels%2FRustFBP", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdmichiels%2FRustFBP'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 88859ff8361765c5fd3d28b2a5771bdbf12fa035
[INFO] checking dmichiels/RustFBP against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdmichiels%2FRustFBP" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/dmichiels/RustFBP on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/dmichiels/RustFBP
[INFO] finished tweaking git repo https://github.com/dmichiels/RustFBP
[INFO] tweaked toml for git repo https://github.com/dmichiels/RustFBP written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/dmichiels/RustFBP already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4caf24f90ce5316d76571240f245c5bbd31be619938c3b89feeb1b0b5dccedda
[INFO] running `Command { std: "docker" "start" "-a" "4caf24f90ce5316d76571240f245c5bbd31be619938c3b89feeb1b0b5dccedda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4caf24f90ce5316d76571240f245c5bbd31be619938c3b89feeb1b0b5dccedda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4caf24f90ce5316d76571240f245c5bbd31be619938c3b89feeb1b0b5dccedda", kill_on_drop: false }`
[INFO] [stdout] 4caf24f90ce5316d76571240f245c5bbd31be619938c3b89feeb1b0b5dccedda
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 210d6d4277542d4f935547a09b7b10ce0f0c26c55c6ed466da992e32cb643d3f
[INFO] running `Command { std: "docker" "start" "-a" "210d6d4277542d4f935547a09b7b10ce0f0c26c55c6ed466da992e32cb643d3f", kill_on_drop: false }`
[INFO] [stderr]     Checking byteorder v0.3.13
[INFO] [stderr]    Compiling libloading v0.2.0
[INFO] [stderr]    Compiling kernel32-sys v0.2.1
[INFO] [stderr]     Checking capnp v0.5.2
[INFO] [stdout] error[E0502]: cannot borrow `*reff` as immutable because it is also borrowed as mutable
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/capnp-0.5.2/src/private/layout.rs:630:47
[INFO] [stdout]     |
[INFO] [stdout] 630 |         let ptr = try!(follow_fars(&mut reff, (*reff).target(), &mut segment));
[INFO] [stdout]     |                        ----------- ---------  ^^^^^^^ immutable borrow occurs here
[INFO] [stdout]     |                        |           |
[INFO] [stdout]     |                        |           mutable borrow occurs here
[INFO] [stdout]     |                        mutable borrow later used by call
[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 E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `capnp`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "210d6d4277542d4f935547a09b7b10ce0f0c26c55c6ed466da992e32cb643d3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "210d6d4277542d4f935547a09b7b10ce0f0c26c55c6ed466da992e32cb643d3f", kill_on_drop: false }`
[INFO] [stdout] 210d6d4277542d4f935547a09b7b10ce0f0c26c55c6ed466da992e32cb643d3f