[INFO] cloning repository https://github.com/cjm00/rust-wfc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cjm00/rust-wfc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcjm00%2Frust-wfc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcjm00%2Frust-wfc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 76b262ba3707afe22f6a6d8a9699aa9413d91955
[INFO] testing cjm00/rust-wfc against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcjm00%2Frust-wfc" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cjm00/rust-wfc on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cjm00/rust-wfc
[INFO] finished tweaking git repo https://github.com/cjm00/rust-wfc
[INFO] tweaked toml for git repo https://github.com/cjm00/rust-wfc written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/cjm00/rust-wfc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b84d2d4f00be466fd023218191988895004b484db9e051f9eb6ae91bf54e30c8
[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" "b84d2d4f00be466fd023218191988895004b484db9e051f9eb6ae91bf54e30c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b84d2d4f00be466fd023218191988895004b484db9e051f9eb6ae91bf54e30c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b84d2d4f00be466fd023218191988895004b484db9e051f9eb6ae91bf54e30c8", kill_on_drop: false }`
[INFO] [stdout] b84d2d4f00be466fd023218191988895004b484db9e051f9eb6ae91bf54e30c8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=warn" "-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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e85226d15503b098d089c49b40bc3e960d77e41a1c7e752ab93be331184dcfa4
[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" "e85226d15503b098d089c49b40bc3e960d77e41a1c7e752ab93be331184dcfa4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling num-traits v0.1.36
[INFO] [stderr]    Compiling matrixmultiply v0.1.13
[INFO] [stderr]    Compiling ndarray v0.9.0
[INFO] [stderr]    Compiling either v1.1.0
[INFO] [stderr]    Compiling adler32 v1.0.0
[INFO] [stderr]    Compiling bitflags v0.7.0
[INFO] [stderr]    Compiling inflate v0.1.1
[INFO] [stderr]    Compiling bit-vec v0.4.3
[INFO] [stderr]    Compiling time v0.1.36
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling deflate v0.7.5
[INFO] [stderr]    Compiling itertools v0.6.0
[INFO] [stderr]    Compiling num-integer v0.1.33
[INFO] [stderr]    Compiling num-complex v0.1.37
[INFO] [stderr]    Compiling num-iter v0.1.33
[INFO] [stderr]    Compiling num v0.1.36
[INFO] [stderr]    Compiling png v0.6.2
[INFO] [stderr]    Compiling chrono v0.3.0
[INFO] [stderr]    Compiling rust-wfc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(try_from)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/overlappingmodel.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 | /         /// Marks all but a single state of the BitVec as forbidden, randomly chosen
[INFO] [stdout] 89 | |         /// from the states still permitted and weighted by their frequency in the original image.
[INFO] [stdout]    | |__________________________________________________________________________________________________^
[INFO] [stdout] 90 |           let mut possible_states = self.possible_states.borrow_mut();
[INFO] [stdout]    |           ------------------------------------------------------------ rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/utils.rs:40:5
[INFO] [stdout]    |
[INFO] [stdout] 40 | /     /// Returns an index from the slice of (T, u) where u is the integer weight, i.e.
[INFO] [stdout] 41 | |     /// [('a', 3), ('b', 1), ('c', 1)] returns 0 (the index of 'a') with probability 3/5
[INFO] [stdout]    | |________________________________________________________________________________________^
[INFO] [stdout] 42 | 
[INFO] [stdout] 43 | /     let total: usize = input.iter()
[INFO] [stdout] 44 | |         .map(|&(_, u)| u)
[INFO] [stdout] 45 | |         .zip(mask.into_iter())
[INFO] [stdout] 46 | |         .filter(|&(_, m)| m)
[INFO] [stdout] 47 | |         .map(|(u, _)| u)
[INFO] [stdout] 48 | |         .sum();
[INFO] [stdout]    | |_______________- rustdoc does not generate documentation for statements
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-wfc`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e85226d15503b098d089c49b40bc3e960d77e41a1c7e752ab93be331184dcfa4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e85226d15503b098d089c49b40bc3e960d77e41a1c7e752ab93be331184dcfa4", kill_on_drop: false }`
[INFO] [stdout] e85226d15503b098d089c49b40bc3e960d77e41a1c7e752ab93be331184dcfa4