[INFO] cloning repository https://github.com/gmlewis/maze-generator [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gmlewis/maze-generator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgmlewis%2Fmaze-generator", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgmlewis%2Fmaze-generator'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 72e957ee75827dabf39627d2ccc8f589939e5270 [INFO] checking gmlewis/maze-generator against master#e23ae72ac7a393961886ea62df065ebb6def7d51 for pr-126571 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgmlewis%2Fmaze-generator" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/gmlewis/maze-generator on toolchain e23ae72ac7a393961886ea62df065ebb6def7d51 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e23ae72ac7a393961886ea62df065ebb6def7d51" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/gmlewis/maze-generator [INFO] finished tweaking git repo https://github.com/gmlewis/maze-generator [INFO] tweaked toml for git repo https://github.com/gmlewis/maze-generator written to /workspace/builds/worker-3-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/gmlewis/maze-generator 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" "+e23ae72ac7a393961886ea62df065ebb6def7d51" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [ERROR] error running command: no output for 300 seconds [ERROR] this task or one of its parent failed! [ERROR] no output for 300 seconds [ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace. [INFO] checking gmlewis/maze-generator against try#397f8958d101b259f6baaf92d107d770c95c3ce0 for pr-126571 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgmlewis%2Fmaze-generator" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/gmlewis/maze-generator on toolchain 397f8958d101b259f6baaf92d107d770c95c3ce0 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+397f8958d101b259f6baaf92d107d770c95c3ce0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/gmlewis/maze-generator [INFO] finished tweaking git repo https://github.com/gmlewis/maze-generator [INFO] tweaked toml for git repo https://github.com/gmlewis/maze-generator written to /workspace/builds/worker-3-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/gmlewis/maze-generator 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" "+397f8958d101b259f6baaf92d107d770c95c3ce0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+397f8958d101b259f6baaf92d107d770c95c3ce0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 73d0759ef6590d4c8ab825f524311dcbc9b618635771ae36b657178769b95ecc [INFO] running `Command { std: "docker" "start" "-a" "73d0759ef6590d4c8ab825f524311dcbc9b618635771ae36b657178769b95ecc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "73d0759ef6590d4c8ab825f524311dcbc9b618635771ae36b657178769b95ecc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "73d0759ef6590d4c8ab825f524311dcbc9b618635771ae36b657178769b95ecc", kill_on_drop: false }` [INFO] [stdout] 73d0759ef6590d4c8ab825f524311dcbc9b618635771ae36b657178769b95ecc [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+397f8958d101b259f6baaf92d107d770c95c3ce0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 6c4dac437e63834ab4de1286c42e0a4bb1c3cd5a92917f42d714219a8051d125 [INFO] running `Command { std: "docker" "start" "-a" "6c4dac437e63834ab4de1286c42e0a4bb1c3cd5a92917f42d714219a8051d125", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.140 [INFO] [stderr] Checking ttf-parser v0.15.2 [INFO] [stderr] Checking ab_glyph_rasterizer v0.1.8 [INFO] [stderr] Checking getrandom v0.2.8 [INFO] [stderr] Checking rand_core v0.6.4 [INFO] [stderr] Checking rand_chacha v0.3.1 [INFO] [stderr] Checking rand v0.8.5 [INFO] [stderr] Checking owned_ttf_parser v0.15.2 [INFO] [stderr] Checking rusttype v0.9.3 [INFO] [stderr] Checking maze-generator v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] error[E0277]: a value of type `Vec<&mut T>` cannot be built from an iterator over elements of type `&T` [INFO] [stdout] --> src/maze/backtracker.rs:24:14 [INFO] [stdout] | [INFO] [stdout] 24 | .collect(); [INFO] [stdout] | ^^^^^^^ value of type `Vec<&mut T>` cannot be built from `std::iter::Iterator` [INFO] [stdout] | [INFO] [stdout] = help: the trait `FromIterator<&T>` is not implemented for `Vec<&mut T>` [INFO] [stdout] = help: the trait `FromIterator<&mut T>` is implemented for `Vec<&mut T>` [INFO] [stdout] note: required by a bound in `collect` [INFO] [stdout] --> /rustc/397f8958d101b259f6baaf92d107d770c95c3ce0/library/core/src/iter/traits/iterator.rs:2001:5 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0277]: a value of type `Vec<&mut T>` cannot be built from an iterator over elements of type `&T` [INFO] [stdout] --> src/maze/backtracker.rs:24:14 [INFO] [stdout] | [INFO] [stdout] 24 | .collect(); [INFO] [stdout] | ^^^^^^^ value of type `Vec<&mut T>` cannot be built from `std::iter::Iterator` [INFO] [stdout] | [INFO] [stdout] = help: the trait `FromIterator<&T>` is not implemented for `Vec<&mut T>` [INFO] [stdout] = help: the trait `FromIterator<&mut T>` is implemented for `Vec<&mut T>` [INFO] [stdout] note: required by a bound in `collect` [INFO] [stdout] --> /rustc/397f8958d101b259f6baaf92d107d770c95c3ce0/library/core/src/iter/traits/iterator.rs:2001:5 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to 1 previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0277`. [INFO] [stdout] [INFO] [stderr] error: could not compile `maze-generator` (lib) due to 2 previous errors [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] error: aborting due to 1 previous error [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0277`. [INFO] [stdout] [INFO] [stderr] error: could not compile `maze-generator` (lib test) due to 2 previous errors [INFO] running `Command { std: "docker" "inspect" "6c4dac437e63834ab4de1286c42e0a4bb1c3cd5a92917f42d714219a8051d125", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "6c4dac437e63834ab4de1286c42e0a4bb1c3cd5a92917f42d714219a8051d125", kill_on_drop: false }` [INFO] [stdout] 6c4dac437e63834ab4de1286c42e0a4bb1c3cd5a92917f42d714219a8051d125