[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 try#e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837 for pr-143619
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgmlewis%2Fmaze-generator" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[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-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/gmlewis/maze-generator on toolchain e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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" "+e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837" "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
[INFO] checking gmlewis/maze-generator against try#e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837 for pr-143619
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgmlewis%2Fmaze-generator" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[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-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/gmlewis/maze-generator on toolchain e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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" "+e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e8955075918b6d00525c617f7c34ee2595c70db70b3cf844dc875e4d3604499b" "/opt/rustwide/cargo-home/bin/cargo" "+e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2f0d76fda7e7deb57194ae7634ea38e4b8f18a9bbdeb30e7c5d6c20ab56223ca
[INFO] running `Command { std: "docker" "start" "-a" "2f0d76fda7e7deb57194ae7634ea38e4b8f18a9bbdeb30e7c5d6c20ab56223ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2f0d76fda7e7deb57194ae7634ea38e4b8f18a9bbdeb30e7c5d6c20ab56223ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f0d76fda7e7deb57194ae7634ea38e4b8f18a9bbdeb30e7c5d6c20ab56223ca", kill_on_drop: false }`
[INFO] [stdout] 2f0d76fda7e7deb57194ae7634ea38e4b8f18a9bbdeb30e7c5d6c20ab56223ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:e8955075918b6d00525c617f7c34ee2595c70db70b3cf844dc875e4d3604499b" "/opt/rustwide/cargo-home/bin/cargo" "+e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a6101b76c7d52d20d3033f7ac9ad39415917670adde90e1b3c05a8f3d680838f
[INFO] running `Command { std: "docker" "start" "-a" "a6101b76c7d52d20d3033f7ac9ad39415917670adde90e1b3c05a8f3d680838f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[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<Item=&T>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromIterator<&_>` is not implemented for `Vec<&mut T>`
[INFO] [stdout]            but trait `FromIterator<&mut _>` is implemented for it
[INFO] [stdout] note: required by a bound in `collect`
[INFO] [stdout]   --> /rustc/e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837/library/core/src/iter/traits/iterator.rs:2014:5
[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<Item=&T>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromIterator<&_>` is not implemented for `Vec<&mut T>`
[INFO] [stdout]            but trait `FromIterator<&mut _>` is implemented for it
[INFO] [stdout] note: required by a bound in `collect`
[INFO] [stdout]   --> /rustc/e784c10fc2dd34bf2bb7b1e51117e35d3f9c5837/library/core/src/iter/traits/iterator.rs:2014:5
[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 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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 1 previous error
[INFO] running `Command { std: "docker" "inspect" "a6101b76c7d52d20d3033f7ac9ad39415917670adde90e1b3c05a8f3d680838f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6101b76c7d52d20d3033f7ac9ad39415917670adde90e1b3c05a8f3d680838f", kill_on_drop: false }`
[INFO] [stdout] a6101b76c7d52d20d3033f7ac9ad39415917670adde90e1b3c05a8f3d680838f