[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] checking cjm00/rust-wfc against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcjm00%2Frust-wfc" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cjm00/rust-wfc on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-0-tc1/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: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num-iter v0.1.33
[INFO] [stderr]   Downloaded num-integer v0.1.33
[INFO] [stderr]   Downloaded adler32 v1.0.0
[INFO] [stderr]   Downloaded inflate v0.1.1
[INFO] [stderr]   Downloaded png v0.6.2
[INFO] [stderr]   Downloaded libc v0.2.21
[INFO] [stderr]   Downloaded bit-vec v0.4.3
[INFO] [stderr]   Downloaded redox_syscall v0.1.17
[INFO] [stderr]   Downloaded time v0.1.36
[INFO] [stderr]   Downloaded chrono v0.3.0
[INFO] [stderr]   Downloaded either v1.1.0
[INFO] [stderr]   Downloaded itertools v0.6.0
[INFO] [stderr]   Downloaded ndarray v0.9.0
[INFO] [stderr]   Downloaded num-complex v0.1.37
[INFO] [stderr]   Downloaded deflate v0.7.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 08b0b7823ae57473c4c8b3346dd4cc2fd51cb601b4897396d5becb7442033635
[INFO] running `Command { std: "docker" "start" "-a" "08b0b7823ae57473c4c8b3346dd4cc2fd51cb601b4897396d5becb7442033635", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "08b0b7823ae57473c4c8b3346dd4cc2fd51cb601b4897396d5becb7442033635", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08b0b7823ae57473c4c8b3346dd4cc2fd51cb601b4897396d5becb7442033635", kill_on_drop: false }`
[INFO] [stdout] 08b0b7823ae57473c4c8b3346dd4cc2fd51cb601b4897396d5becb7442033635
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f8de92d4ad6ecde312f1ce9167e33370547dba7a1050558c39afc650784a4a7
[INFO] running `Command { std: "docker" "start" "-a" "1f8de92d4ad6ecde312f1ce9167e33370547dba7a1050558c39afc650784a4a7", kill_on_drop: false }`
[INFO] [stderr]     Checking num-traits v0.1.36
[INFO] [stderr]    Compiling matrixmultiply v0.1.13
[INFO] [stderr]     Checking libc v0.2.21
[INFO] [stderr]     Checking rawpointer v0.1.0
[INFO] [stderr]     Checking either v1.1.0
[INFO] [stderr]     Checking adler32 v1.0.0
[INFO] [stderr]     Checking byteorder v1.0.0
[INFO] [stderr]    Compiling ndarray v0.9.0
[INFO] [stderr]     Checking inflate v0.1.1
[INFO] [stderr]     Checking bitflags v0.7.0
[INFO] [stderr]     Checking bit-vec v0.4.3
[INFO] [stderr]     Checking itertools v0.6.0
[INFO] [stderr]     Checking deflate v0.7.5
[INFO] [stderr]     Checking num-integer v0.1.33
[INFO] [stderr]     Checking num-complex v0.1.37
[INFO] [stderr]     Checking time v0.1.36
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking num-iter v0.1.33
[INFO] [stderr]     Checking num v0.1.36
[INFO] [stderr]     Checking chrono v0.3.0
[INFO] [stderr]     Checking png v0.6.2
[INFO] [stderr]     Checking rust-wfc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `rand` is imported redundantly
[INFO] [stdout]   --> src/overlappingmodel.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rand;
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/main.rs:8:1
[INFO] [stdout]    |
[INFO] [stdout] 8  | extern crate rand;
[INFO] [stdout]    | ------------------ the item `rand` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[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]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `rand` is imported redundantly
[INFO] [stdout]  --> src/utils.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/main.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | extern crate rand;
[INFO] [stdout]   | ------------------ the item `rand` is already imported here
[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]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `try_from` has been stable since 1.34.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(try_from)]
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `rand` is imported redundantly
[INFO] [stdout]   --> src/overlappingmodel.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use rand;
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/main.rs:8:1
[INFO] [stdout]    |
[INFO] [stdout] 8  | extern crate rand;
[INFO] [stdout]    | ------------------ the item `rand` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[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]    = help: use `//` for a plain comment
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `rand` is imported redundantly
[INFO] [stdout]  --> src/utils.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use rand;
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/main.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | extern crate rand;
[INFO] [stdout]   | ------------------ the item `rand` is already imported here
[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]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `try_from` has been stable since 1.34.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(try_from)]
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `coord`
[INFO] [stdout]    --> src/overlappingmodel.rs:421:45
[INFO] [stdout]     |
[INFO] [stdout] 421 |     fn wrap_coord<T: TryInto<usize>>(&self, coord: (T, T)) -> Result<(usize, usize), ()> {
[INFO] [stdout]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_coord`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `coord`
[INFO] [stdout]    --> src/overlappingmodel.rs:421:45
[INFO] [stdout]     |
[INFO] [stdout] 421 |     fn wrap_coord<T: TryInto<usize>>(&self, coord: (T, T)) -> Result<(usize, usize), ()> {
[INFO] [stdout]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_coord`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.76s
[INFO] running `Command { std: "docker" "inspect" "1f8de92d4ad6ecde312f1ce9167e33370547dba7a1050558c39afc650784a4a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f8de92d4ad6ecde312f1ce9167e33370547dba7a1050558c39afc650784a4a7", kill_on_drop: false }`
[INFO] [stdout] 1f8de92d4ad6ecde312f1ce9167e33370547dba7a1050558c39afc650784a4a7