[INFO] cloning repository https://github.com/KayJay7/rpn-c
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KayJay7/rpn-c" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKayJay7%2Frpn-c", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKayJay7%2Frpn-c'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b75643e74bc973b2e8be9def72a32cb8c24a8ebc
[INFO] checking KayJay7/rpn-c/b75643e74bc973b2e8be9def72a32cb8c24a8ebc against master#4455c8937007f3cc3c078375a335d86dbab391ce for pr-140956
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKayJay7%2Frpn-c" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-4-tc1/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/KayJay7/rpn-c
[INFO] finished tweaking git repo https://github.com/KayJay7/rpn-c
[INFO] tweaked toml for git repo https://github.com/KayJay7/rpn-c written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/KayJay7/rpn-c on toolchain 4455c8937007f3cc3c078375a335d86dbab391ce
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4455c8937007f3cc3c078375a335d86dbab391ce" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/KayJay7/rpn-c 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" "+4455c8937007f3cc3c078375a335d86dbab391ce" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded logos v0.12.0
[INFO] [stderr]   Downloaded rustc-cfg v0.4.0
[INFO] [stderr]   Downloaded beef v0.5.1
[INFO] [stderr]   Downloaded hamming v0.1.3
[INFO] [stderr]   Downloaded logos-derive v0.12.0
[INFO] [stderr]   Downloaded ramp v0.7.0
[INFO] [stderr]   Downloaded nix v0.22.2
[INFO] [stderr]   Downloaded object v0.26.2
[INFO] [stderr]   Downloaded syn v1.0.78
[INFO] [stderr]   Downloaded libc v0.2.103
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+4455c8937007f3cc3c078375a335d86dbab391ce" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ab3009b8439bed7c455600a751eecec6f8f2963c11d0d7e26e50e2fdbd73d810
[INFO] running `Command { std: "docker" "start" "-a" "ab3009b8439bed7c455600a751eecec6f8f2963c11d0d7e26e50e2fdbd73d810", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab3009b8439bed7c455600a751eecec6f8f2963c11d0d7e26e50e2fdbd73d810", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab3009b8439bed7c455600a751eecec6f8f2963c11d0d7e26e50e2fdbd73d810", kill_on_drop: false }`
[INFO] [stdout] ab3009b8439bed7c455600a751eecec6f8f2963c11d0d7e26e50e2fdbd73d810
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+4455c8937007f3cc3c078375a335d86dbab391ce" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6858907da8d6b54d91517131832d0df1a8f82540c7cd64b6c9f8b64262f2b6e9
[INFO] running `Command { std: "docker" "start" "-a" "6858907da8d6b54d91517131832d0df1a8f82540c7cd64b6c9f8b64262f2b6e9", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling syn v1.0.78
[INFO] [stderr]    Compiling cc v1.0.70
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling gimli v0.25.0
[INFO] [stderr]    Compiling rustc-demangle v0.1.21
[INFO] [stderr]    Compiling num-bigint v0.4.2
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]     Checking nibble_vec v0.1.0
[INFO] [stderr]    Compiling utf8-ranges v1.0.4
[INFO] [stderr]     Checking endian-type v0.1.2
[INFO] [stderr]    Compiling beef v0.5.1
[INFO] [stderr]     Checking radix_trie v0.2.1
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking ieee754 v0.2.6
[INFO] [stderr]     Checking hamming v0.1.3
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]     Checking unicode-segmentation v1.8.0
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking utf8parse v0.2.0
[INFO] [stderr]    Compiling object v0.26.2
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking dirs-sys-next v0.1.2
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking fd-lock v3.0.0
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]     Checking nix v0.22.2
[INFO] [stderr]     Checking env_logger v0.8.4
[INFO] [stderr]     Checking directories v3.0.2
[INFO] [stderr]     Checking dirs-next v2.0.0
[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]    Compiling addr2line v0.16.0
[INFO] [stderr]     Checking rustyline v9.0.0
[INFO] [stderr]    Compiling synstructure v0.12.5
[INFO] [stderr]    Compiling logos-derive v0.12.0
[INFO] [stderr]    Compiling rustyline-derive v0.4.0
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling rustc-cfg v0.4.0
[INFO] [stderr]    Compiling ramp v0.7.0
[INFO] [stdout] error[E0053]: method `steps_between` has an incompatible type for trait
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/ramp-0.7.0/src/int.rs:3702:49
[INFO] [stdout]      |
[INFO] [stdout] 3702 |     fn steps_between(start: &Int, end: &Int) -> Option<usize> {
[INFO] [stdout]      |                                                 ^^^^^^^^^^^^^ expected `(usize, Option<usize>)`, found `Option<usize>`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected signature `fn(&Int, &Int) -> (usize, Option<usize>)`
[INFO] [stdout]                 found signature `fn(&Int, &Int) -> Option<usize>`
[INFO] [stdout] help: change the output type to match the trait
[INFO] [stdout]      |
[INFO] [stdout] 3702 -     fn steps_between(start: &Int, end: &Int) -> Option<usize> {
[INFO] [stdout] 3702 +     fn steps_between(start: &Int, end: &Int) -> (usize, Option<usize>) {
[INFO] [stdout]      |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking logos v0.12.0
[INFO] [stdout] For more information about this error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ramp` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "6858907da8d6b54d91517131832d0df1a8f82540c7cd64b6c9f8b64262f2b6e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6858907da8d6b54d91517131832d0df1a8f82540c7cd64b6c9f8b64262f2b6e9", kill_on_drop: false }`
[INFO] [stdout] 6858907da8d6b54d91517131832d0df1a8f82540c7cd64b6c9f8b64262f2b6e9