[INFO] cloning repository https://github.com/DerDoni/rust_book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/DerDoni/rust_book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDerDoni%2Frust_book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDerDoni%2Frust_book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3340e580a3ca6f4999621d79bb705cce7b735d60
[INFO] checking DerDoni/rust_book against try#a7a572ce3edd6d476191fbfe92c9c1986e009b34 for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDerDoni%2Frust_book" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/DerDoni/rust_book on toolchain a7a572ce3edd6d476191fbfe92c9c1986e009b34
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/DerDoni/rust_book
[INFO] finished tweaking git repo https://github.com/DerDoni/rust_book
[INFO] tweaked toml for git repo https://github.com/DerDoni/rust_book written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/DerDoni/rust_book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a96a41ca1d73d9261c1328e76f7e992afeff392198bd28ca445d2d6c12d24a49
[INFO] running `Command { std: "docker" "start" "-a" "a96a41ca1d73d9261c1328e76f7e992afeff392198bd28ca445d2d6c12d24a49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a96a41ca1d73d9261c1328e76f7e992afeff392198bd28ca445d2d6c12d24a49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a96a41ca1d73d9261c1328e76f7e992afeff392198bd28ca445d2d6c12d24a49", kill_on_drop: false }`
[INFO] [stdout] a96a41ca1d73d9261c1328e76f7e992afeff392198bd28ca445d2d6c12d24a49
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "+a7a572ce3edd6d476191fbfe92c9c1986e009b34" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 896e377eaaf0add34ca2825236449ee3937dfe5db3ee70d648161fa4d023e12b
[INFO] running `Command { std: "docker" "start" "-a" "896e377eaaf0add34ca2825236449ee3937dfe5db3ee70d648161fa4d023e12b", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] Running `cargo fix --edition`
[INFO] [stderr]     Checking exercise v0.1.0 (/tmp/fixit)
[INFO] [stderr]    Migrating src/main.rs from 2018 edition to 2021
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |   fn mode(ints: &Vec<i32>) -> i32 {
[INFO] [stdout]    |                               --- expected `i32` because of return type
[INFO] [stdout] 32 |       let mut map = HashMap::new();
[INFO] [stdout] 33 | /     for number in ints {
[INFO] [stdout] 34 | |         let count = map.entry(number).or_insert(0);
[INFO] [stdout] 35 | |         *count += 1;
[INFO] [stdout] 36 | |     }
[INFO] [stdout]    | |_____^ expected `i32`, found `()`
[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 E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exercise` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/main.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |   fn mode(ints: &Vec<i32>) -> i32 {
[INFO] [stdout]    |                               --- expected `i32` because of return type
[INFO] [stdout] 32 |       let mut map = HashMap::new();
[INFO] [stdout] 33 | /     for number in ints {
[INFO] [stdout] 34 | |         let count = map.entry(number).or_insert(0);
[INFO] [stdout] 35 | |         *count += 1;
[INFO] [stdout] 36 | |     }
[INFO] [stdout]    | |_____^ expected `i32`, found `()`
[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 E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] [stderr] error: failed to migrate to next edition
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `cargo fix --edition --allow-no-vcs --allow-dirty --frozen --all --all-targets --message-format=json` (exit status: 101)
[INFO] running `Command { std: "docker" "inspect" "896e377eaaf0add34ca2825236449ee3937dfe5db3ee70d648161fa4d023e12b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "896e377eaaf0add34ca2825236449ee3937dfe5db3ee70d648161fa4d023e12b", kill_on_drop: false }`
[INFO] [stdout] 896e377eaaf0add34ca2825236449ee3937dfe5db3ee70d648161fa4d023e12b