[INFO] cloning repository https://github.com/mreboland/rustTypesStrings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mreboland/rustTypesStrings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmreboland%2FrustTypesStrings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmreboland%2FrustTypesStrings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 93268bf785e18b962d7ffbd8bfa6b4d6029a7bdb
[INFO] testing mreboland/rustTypesStrings against master#432e145bd5a974c5b6f4dd9b352891bd7502b69d for pr-87041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmreboland%2FrustTypesStrings" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mreboland/rustTypesStrings on toolchain 432e145bd5a974c5b6f4dd9b352891bd7502b69d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mreboland/rustTypesStrings
[INFO] finished tweaking git repo https://github.com/mreboland/rustTypesStrings
[INFO] tweaked toml for git repo https://github.com/mreboland/rustTypesStrings written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/mreboland/rustTypesStrings already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0cae2f9d2a2de72a7d70242fff25f71508281ca01fc1f4208d811cb2b6286000
[INFO] running `Command { std: "docker" "start" "-a" "0cae2f9d2a2de72a7d70242fff25f71508281ca01fc1f4208d811cb2b6286000", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0cae2f9d2a2de72a7d70242fff25f71508281ca01fc1f4208d811cb2b6286000", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0cae2f9d2a2de72a7d70242fff25f71508281ca01fc1f4208d811cb2b6286000", kill_on_drop: false }`
[INFO] [stdout] 0cae2f9d2a2de72a7d70242fff25f71508281ca01fc1f4208d811cb2b6286000
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "+432e145bd5a974c5b6f4dd9b352891bd7502b69d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 637ffb2b22204dd9a6e16ac5e10c0625a42200a97bb29d4e88eff48ef529ccb2
[INFO] running `Command { std: "docker" "start" "-a" "637ffb2b22204dd9a6e16ac5e10c0625a42200a97bb29d4e88eff48ef529ccb2", kill_on_drop: false }`
[INFO] [stderr]    Compiling types-strings v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0277]: the type `str` cannot be indexed by `{integer}`
[INFO] [stdout]   --> src/main.rs:75:5
[INFO] [stdout]    |
[INFO] [stdout] 75 |     s[0] = 'c'; // error: the type `str` cannot be mutably indexed
[INFO] [stdout]    |     ^^^^ string indices are ranges of `usize`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `SliceIndex<str>` is not implemented for `{integer}`
[INFO] [stdout]    = note: you can use `.chars().nth()` or `.bytes().nth()`
[INFO] [stdout]            for more information, see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
[INFO] [stdout]    = note: required because of the requirements on the impl of `Index<{integer}>` for `str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `push` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/main.rs:76:7
[INFO] [stdout]    |
[INFO] [stdout] 76 |     s.push('\n'); // error: no method named `push` found for type `&str`
[INFO] [stdout]    |       ^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `types-strings`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "637ffb2b22204dd9a6e16ac5e10c0625a42200a97bb29d4e88eff48ef529ccb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "637ffb2b22204dd9a6e16ac5e10c0625a42200a97bb29d4e88eff48ef529ccb2", kill_on_drop: false }`
[INFO] [stdout] 637ffb2b22204dd9a6e16ac5e10c0625a42200a97bb29d4e88eff48ef529ccb2