[INFO] cloning repository https://github.com/stevewirts/rust_string_exercises
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/stevewirts/rust_string_exercises" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevewirts%2Frust_string_exercises", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevewirts%2Frust_string_exercises'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dde09cc603ab208b219c9130dec778c7e587d669
[INFO] checking stevewirts/rust_string_exercises against try#894d32a5432c6a6461bb2aac7c3d5f2e87dce83f for pr-77015
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstevewirts%2Frust_string_exercises" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/stevewirts/rust_string_exercises on toolchain 894d32a5432c6a6461bb2aac7c3d5f2e87dce83f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/stevewirts/rust_string_exercises
[INFO] finished tweaking git repo https://github.com/stevewirts/rust_string_exercises
[INFO] tweaked toml for git repo https://github.com/stevewirts/rust_string_exercises written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/stevewirts/rust_string_exercises already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 63c9902f4986b41cc6e86f761768f7cabd25bd56db743337cb1631e9f9ac5271
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "63c9902f4986b41cc6e86f761768f7cabd25bd56db743337cb1631e9f9ac5271", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "63c9902f4986b41cc6e86f761768f7cabd25bd56db743337cb1631e9f9ac5271", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63c9902f4986b41cc6e86f761768f7cabd25bd56db743337cb1631e9f9ac5271", kill_on_drop: false }`
[INFO] [stdout] 63c9902f4986b41cc6e86f761768f7cabd25bd56db743337cb1631e9f9ac5271
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bacc8828f9946b85967aa6169268462f7a2288d70db2057f78a6cadd6e6f2216
[INFO] running `Command { std: "docker" "start" "-a" "bacc8828f9946b85967aa6169268462f7a2288d70db2057f78a6cadd6e6f2216", kill_on_drop: false }`
[INFO] [stderr]     Checking one v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed for `HashSet<T>`
[INFO] [stdout]   --> src/main.rs:68:23
[INFO] [stdout]    |
[INFO] [stdout] 68 |             let set = HashSet::new();
[INFO] [stdout]    |                 ---   ^^^^^^^^^^^^ cannot infer type for type parameter `T`
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 consider giving `set` the explicit type `HashSet<T>`, where the type parameter `T` is specified
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed for `HashSet<T>`
[INFO] [stdout]   --> src/main.rs:68:23
[INFO] [stdout]    |
[INFO] [stdout] 68 |             let set = HashSet::new();
[INFO] [stdout]    |                 ---   ^^^^^^^^^^^^ cannot infer type for type parameter `T`
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 consider giving `set` the explicit type `HashSet<T>`, where the type parameter `T` is specified
[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 E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `one`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "bacc8828f9946b85967aa6169268462f7a2288d70db2057f78a6cadd6e6f2216", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bacc8828f9946b85967aa6169268462f7a2288d70db2057f78a6cadd6e6f2216", kill_on_drop: false }`
[INFO] [stdout] bacc8828f9946b85967aa6169268462f7a2288d70db2057f78a6cadd6e6f2216