[INFO] cloning repository https://github.com/javierpb275/rust1
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/javierpb275/rust1" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjavierpb275%2Frust1", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjavierpb275%2Frust1'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1778553dd585e5784f31b30573eb5664015c2d49
[INFO] building javierpb275/rust1 against master#ad211ced81509462cdfe4c29ed10f97279a0acae for pr-135216
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjavierpb275%2Frust1" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/javierpb275/rust1 on toolchain ad211ced81509462cdfe4c29ed10f97279a0acae
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/javierpb275/rust1
[INFO] finished tweaking git repo https://github.com/javierpb275/rust1
[INFO] tweaked toml for git repo https://github.com/javierpb275/rust1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/javierpb275/rust1 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" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 26997b4148cfb5bae4fd9e800dee44e76bafb4a74348dc1b61240a093dbbe672
[INFO] running `Command { std: "docker" "start" "-a" "26997b4148cfb5bae4fd9e800dee44e76bafb4a74348dc1b61240a093dbbe672", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "26997b4148cfb5bae4fd9e800dee44e76bafb4a74348dc1b61240a093dbbe672", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26997b4148cfb5bae4fd9e800dee44e76bafb4a74348dc1b61240a093dbbe672", kill_on_drop: false }`
[INFO] [stdout] 26997b4148cfb5bae4fd9e800dee44e76bafb4a74348dc1b61240a093dbbe672
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+ad211ced81509462cdfe4c29ed10f97279a0acae" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bd1f96b851523e0f723488b59f06760856d2362de9802d9bebdef68f82238bc5
[INFO] running `Command { std: "docker" "start" "-a" "bd1f96b851523e0f723488b59f06760856d2362de9802d9bebdef68f82238bc5", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust1 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0596]: cannot borrow `*some_string` as mutable, as it is behind a `&` reference
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     some_string.push_str(", world");
[INFO] [stdout]    |     ^^^^^^^^^^^ `some_string` is a `&` reference, so the data it refers to cannot be borrowed as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be a mutable reference
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn change(some_string: &mut String) {
[INFO] [stdout]    |                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust1` (bin "rust1") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "bd1f96b851523e0f723488b59f06760856d2362de9802d9bebdef68f82238bc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd1f96b851523e0f723488b59f06760856d2362de9802d9bebdef68f82238bc5", kill_on_drop: false }`
[INFO] [stdout] bd1f96b851523e0f723488b59f06760856d2362de9802d9bebdef68f82238bc5