[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] checking kstrohbeck/picross-solver against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkstrohbeck%2Fpicross-solver" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kstrohbeck/picross-solver on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "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-2/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" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "fetch" "--locked" "--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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0214cd4eed82865ba1be4efe95c7cc964b3486a50d5b6bc16b37b73b08c8ce4b
[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" "0214cd4eed82865ba1be4efe95c7cc964b3486a50d5b6bc16b37b73b08c8ce4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0214cd4eed82865ba1be4efe95c7cc964b3486a50d5b6bc16b37b73b08c8ce4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0214cd4eed82865ba1be4efe95c7cc964b3486a50d5b6bc16b37b73b08c8ce4b", kill_on_drop: false }`
[INFO] [stdout] 0214cd4eed82865ba1be4efe95c7cc964b3486a50d5b6bc16b37b73b08c8ce4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 59c5f260414617d707b1f4644e9fc63f78bf5784754f39eda5e4540013613852
[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" "59c5f260414617d707b1f4644e9fc63f78bf5784754f39eda5e4540013613852", 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v0.4.13
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling ryu v0.2.6
[INFO] [stderr]     Checking streaming-iterator v0.1.4
[INFO] [stderr]     Checking itertools v0.7.8
[INFO] [stderr]     Checking serde v1.0.75
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking serde_json v1.0.26
[INFO] [stderr]    Compiling serde_derive v1.0.75
[INFO] [stderr]     Checking 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] [stderr] warning: build failed, waiting for other jobs to finish...
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "59c5f260414617d707b1f4644e9fc63f78bf5784754f39eda5e4540013613852", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "59c5f260414617d707b1f4644e9fc63f78bf5784754f39eda5e4540013613852", kill_on_drop: false }`
[INFO] [stdout] 59c5f260414617d707b1f4644e9fc63f78bf5784754f39eda5e4540013613852