[INFO] updating cached repository https://github.com/kstrohbeck/picross-solver
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8f538c9a0565d817c8963e8ccebb15bdc8162841
[INFO] testing kstrohbeck/picross-solver against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkstrohbeck%2Fpicross-solver" "/workspace/builds/worker-5/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kstrohbeck/picross-solver on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-5/source/Cargo.toml
[INFO] crate git repo https://github.com/kstrohbeck/picross-solver already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 14650cb736f01dc6eb51447ff963a060541162650e184774c0fd5bafea202450
[INFO] running `"docker" "start" "-a" "14650cb736f01dc6eb51447ff963a060541162650e184774c0fd5bafea202450"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: the cargo feature `edition` is now stable and is no longer necessary to be listed in the manifest
[INFO] [stderr]    Compiling proc-macro2 v0.4.13
[INFO] [stderr]    Compiling ryu v0.2.6
[INFO] [stderr]    Compiling serde v1.0.75
[INFO] [stderr]    Compiling itoa v0.4.2
[INFO] [stderr]    Compiling either v1.5.0
[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] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(uniform_paths)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `step_as_child` found for mutable reference `&mut puzzle::Puzzle` in the current scope
[INFO] [stderr]   --> src/puzzle.rs:98:30
[INFO] [stderr]    |
[INFO] [stderr] 98 |         while let res = self.step_as_child() {
[INFO] [stderr]    |                              ^^^^^^^^^^^^^ help: there is an associated function with a similar name: `solve_as_child`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]   --> src/puzzle.rs:98:9
[INFO] [stderr]    |
[INFO] [stderr] 97 |       pub fn solve_as_child(&mut self) -> Option<bool> {
[INFO] [stderr]    |                                           ------------ expected `std::option::Option<bool>` because of return type
[INFO] [stderr] 98 | /         while let res = self.step_as_child() {
[INFO] [stderr] 99 | |         }
[INFO] [stderr]    | |_________^ expected enum `std::option::Option`, found `()`
[INFO] [stderr]    |
[INFO] [stderr]    = note:   expected enum `std::option::Option<bool>`
[INFO] [stderr]            found unit type `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] error: could not compile `picross-solver`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "14650cb736f01dc6eb51447ff963a060541162650e184774c0fd5bafea202450"`
[INFO] running `"docker" "rm" "-f" "14650cb736f01dc6eb51447ff963a060541162650e184774c0fd5bafea202450"`
[INFO] [stdout] 14650cb736f01dc6eb51447ff963a060541162650e184774c0fd5bafea202450