[INFO] cloning repository khionu/sudoku_solver
[INFO] running `"git" "clone" "--bare" "git://github.com/khionu/sudoku_solver.git" "work/cache/sources/gh/khionu/sudoku_solver"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/khionu/sudoku_solver'...
[INFO] running `"git" "clone" "work/cache/sources/gh/khionu/sudoku_solver" "work/ex/beta-1.37-6/sources/1.36.0/gh/khionu/sudoku_solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/khionu/sudoku_solver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/khionu/sudoku_solver" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/khionu/sudoku_solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/khionu/sudoku_solver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 84c98ab4002e56403bfe6b0a2a58a56d968eddf9
[INFO] sha for GitHub repo khionu/sudoku_solver: 84c98ab4002e56403bfe6b0a2a58a56d968eddf9
[INFO] validating manifest of khionu/sudoku_solver on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of khionu/sudoku_solver on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing khionu/sudoku_solver
[INFO] finished frobbing khionu/sudoku_solver
[INFO] frobbed toml for khionu/sudoku_solver written to work/ex/beta-1.37-6/sources/1.36.0/gh/khionu/sudoku_solver/Cargo.toml
[INFO] started frobbing khionu/sudoku_solver
[INFO] finished frobbing khionu/sudoku_solver
[INFO] frobbed toml for khionu/sudoku_solver written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/khionu/sudoku_solver/Cargo.toml
[INFO] crate khionu/sudoku_solver already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing khionu/sudoku_solver against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/khionu/sudoku_solver:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] b25c9c9071ea4bfae10c51d9c62e7b2ec1a4d5207e0f430eb2118cb1b1b1ebef
[INFO] running `"docker" "start" "-a" "b25c9c9071ea4bfae10c51d9c62e7b2ec1a4d5207e0f430eb2118cb1b1b1ebef"`
[INFO] [stderr]    Compiling sudoku_solver v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0599]: no function or associated item named `from_str` found for type `usize` in the current scope
[INFO] [stderr]   --> src/main.rs:75:26
[INFO] [stderr]    |
[INFO] [stderr] 75 |     let threads = usize::from_str(std::env::var("RUST_SUDOKU_THREADS")
[INFO] [stderr]    |                          ^^^^^^^^ function or associated item not found in `usize`
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the trait is in scope
[INFO] [stderr] help: the following trait is implemented but not in scope, perhaps add a `use` for it:
[INFO] [stderr]    |
[INFO] [stderr] 3  | use std::str::FromStr;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: Could not compile `sudoku_solver`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b25c9c9071ea4bfae10c51d9c62e7b2ec1a4d5207e0f430eb2118cb1b1b1ebef"`
[INFO] running `"docker" "rm" "-f" "b25c9c9071ea4bfae10c51d9c62e7b2ec1a4d5207e0f430eb2118cb1b1b1ebef"`
[INFO] [stdout] b25c9c9071ea4bfae10c51d9c62e7b2ec1a4d5207e0f430eb2118cb1b1b1ebef