[INFO] cloning repository https://github.com/kstrohbeck/picross-solver
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kstrohbeck/picross-solver" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkstrohbeck%2Fpicross-solver", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkstrohbeck%2Fpicross-solver'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8f538c9a0565d817c8963e8ccebb15bdc8162841
[INFO] building kstrohbeck/picross-solver against master#ff34b919075f35a1787659e9c448a34b06bab8de for issue-85264
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkstrohbeck%2Fpicross-solver" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kstrohbeck/picross-solver on toolchain ff34b919075f35a1787659e9c448a34b06bab8de
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kstrohbeck/picross-solver
[INFO] finished tweaking git repo https://github.com/kstrohbeck/picross-solver
[INFO] tweaked toml for git repo https://github.com/kstrohbeck/picross-solver written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/kstrohbeck/picross-solver already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `edition` has been stabilized in the 1.31 release and is no longer necessary to be listed in the manifest
[INFO] [stderr]   See https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-edition-field for more information about using this feature.
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2105f93319a23193801aaa46ca9b51840a9bb29f961cdedf02d5c7b6558a021e
[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" "2105f93319a23193801aaa46ca9b51840a9bb29f961cdedf02d5c7b6558a021e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2105f93319a23193801aaa46ca9b51840a9bb29f961cdedf02d5c7b6558a021e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2105f93319a23193801aaa46ca9b51840a9bb29f961cdedf02d5c7b6558a021e", kill_on_drop: false }`
[INFO] [stdout] 2105f93319a23193801aaa46ca9b51840a9bb29f961cdedf02d5c7b6558a021e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ac9bd2f8b7d7987068919ef74839c2316a76d99a3b0981719c4e795c38b828ac
[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" "ac9bd2f8b7d7987068919ef74839c2316a76d99a3b0981719c4e795c38b828ac", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `edition` has been stabilized in the 1.31 release and is no longer necessary to be listed in the manifest
[INFO] [stderr]   See https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-edition-field for more information about using this feature.
[INFO] [stderr]    Compiling proc-macro2 v0.4.13
[INFO] [stderr]    Compiling serde v1.0.75
[INFO] [stderr]    Compiling itoa v0.4.2
[INFO] [stderr]    Compiling streaming-iterator v0.1.4
[INFO] [stderr]    Compiling itertools v0.7.8
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling serde_derive v1.0.75
[INFO] [stderr]    Compiling serde_json v1.0.26
[INFO] [stderr]    Compiling picross-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `step_as_child` found for mutable reference `&mut Puzzle` in the current scope
[INFO] [stdout]   --> src/puzzle.rs:98:30
[INFO] [stdout]    |
[INFO] [stdout] 98 |         while let res = self.step_as_child() {
[INFO] [stdout]    |                              ^^^^^^^^^^^^^ help: there is an associated function with a similar name: `solve_as_child`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/puzzle.rs:98:9
[INFO] [stdout]    |
[INFO] [stdout] 97 |       pub fn solve_as_child(&mut self) -> Option<bool> {
[INFO] [stdout]    |                                           ------------ expected `std::option::Option<bool>` because of return type
[INFO] [stdout] 98 | /         while let res = self.step_as_child() {
[INFO] [stdout] 99 | |         }
[INFO] [stdout]    | |_________^ expected enum `std::option::Option`, found `()`
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected enum `std::option::Option<bool>`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `picross-solver`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "ac9bd2f8b7d7987068919ef74839c2316a76d99a3b0981719c4e795c38b828ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac9bd2f8b7d7987068919ef74839c2316a76d99a3b0981719c4e795c38b828ac", kill_on_drop: false }`
[INFO] [stdout] ac9bd2f8b7d7987068919ef74839c2316a76d99a3b0981719c4e795c38b828ac
