[INFO] fetching crate scanlan_sudoku 0.1.0...
[INFO] checking scanlan_sudoku-0.1.0 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate scanlan_sudoku 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate scanlan_sudoku 0.1.0
[INFO] finished tweaking crates.io crate scanlan_sudoku 0.1.0
[INFO] tweaked toml for crates.io crate scanlan_sudoku 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate scanlan_sudoku 0.1.0 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate scanlan_sudoku 0.1.0 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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 41ab073664d0288f3edc2413e93c9c9a7ddd01d5aa1584ee9ebb75d254122286
[INFO] running `Command { std: "docker" "start" "-a" "41ab073664d0288f3edc2413e93c9c9a7ddd01d5aa1584ee9ebb75d254122286", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "41ab073664d0288f3edc2413e93c9c9a7ddd01d5aa1584ee9ebb75d254122286", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41ab073664d0288f3edc2413e93c9c9a7ddd01d5aa1584ee9ebb75d254122286", kill_on_drop: false }`
[INFO] [stdout] 41ab073664d0288f3edc2413e93c9c9a7ddd01d5aa1584ee9ebb75d254122286
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9431bf73f530636c1cfd9ed4aae83cf9cdeedc3e96a1ae4b9bea0c04755d139c
[INFO] running `Command { std: "docker" "start" "-a" "9431bf73f530636c1cfd9ed4aae83cf9cdeedc3e96a1ae4b9bea0c04755d139c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.141
[INFO] [stderr]     Checking regex-syntax v0.7.1
[INFO] [stderr]     Checking aho-corasick v1.0.1
[INFO] [stderr]     Checking getrandom v0.2.9
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking colored v2.0.0
[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 regex v1.8.1
[INFO] [stderr]     Checking scanlan_sudoku v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `slice_flatten` has been stable since 1.80.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_flatten)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `slice_flatten` has been stable since 1.80.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_flatten)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: `[[Coord; 9]; 9]` is not an iterator
[INFO] [stdout]   --> src/logic/generator.rs:23:25
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let coords = coords.flatten();
[INFO] [stdout]    |                         ^^^^^^^ `[[Coord; 9]; 9]` is not an iterator
[INFO] [stdout]    |
[INFO] [stdout]    = note: the following trait bounds were not satisfied:
[INFO] [stdout]            `[[Coord; 9]; 9]: Iterator`
[INFO] [stdout]            which is required by `&mut [[Coord; 9]; 9]: Iterator`
[INFO] [stdout]            `[[Coord; 9]]: Iterator`
[INFO] [stdout]            which is required by `&mut [[Coord; 9]]: Iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: `[[Coord; 9]; 9]` is not an iterator
[INFO] [stdout]   --> src/logic/generator.rs:23:25
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let coords = coords.flatten();
[INFO] [stdout]    |                         ^^^^^^^ `[[Coord; 9]; 9]` is not an iterator
[INFO] [stdout]    |
[INFO] [stdout]    = note: the following trait bounds were not satisfied:
[INFO] [stdout]            `[[Coord; 9]; 9]: Iterator`
[INFO] [stdout]            which is required by `&mut [[Coord; 9]; 9]: Iterator`
[INFO] [stdout]            `[[Coord; 9]]: Iterator`
[INFO] [stdout]            which is required by `&mut [[Coord; 9]]: Iterator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `scanlan_sudoku` (lib test) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `scanlan_sudoku` (lib) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "9431bf73f530636c1cfd9ed4aae83cf9cdeedc3e96a1ae4b9bea0c04755d139c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9431bf73f530636c1cfd9ed4aae83cf9cdeedc3e96a1ae4b9bea0c04755d139c", kill_on_drop: false }`
[INFO] [stdout] 9431bf73f530636c1cfd9ed4aae83cf9cdeedc3e96a1ae4b9bea0c04755d139c