[INFO] updating cached repository https://github.com/arturts/ProjectEuler-Rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/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] 0d6b5ae9979049d6258101fbe55eb91fefc7d39d
[INFO] checking arturts/ProjectEuler-Rust against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Farturts%2FProjectEuler-Rust" "work/builds/worker-4/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/arturts/ProjectEuler-Rust on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/arturts/ProjectEuler-Rust
[INFO] finished tweaking git repo https://github.com/arturts/ProjectEuler-Rust
[INFO] tweaked toml for git repo https://github.com/arturts/ProjectEuler-Rust written to work/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/arturts/ProjectEuler-Rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 9fdf6c868d9e0935164cc5fd06f55478b9110a383c12b759504f3bff7012e7c8
[INFO] running `"docker" "start" "-a" "9fdf6c868d9e0935164cc5fd06f55478b9110a383c12b759504f3bff7012e7c8"`
[INFO] [stderr]     Checking project_euler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0600]: cannot apply unary operator `-` to type `usize`
[INFO] [stderr]  --> src/problem_4/mod.rs:4:36
[INFO] [stderr]   |
[INFO] [stderr] 4 |     for num_a in (999..99).step_by(-1) {
[INFO] [stderr]   |                                    ^^ cannot apply unary operator `-`
[INFO] [stderr]   |
[INFO] [stderr]   = note: unsigned values cannot be negated
[INFO] [stderr] 
[INFO] [stderr] error[E0600]: cannot apply unary operator `-` to type `usize`
[INFO] [stderr]  --> src/problem_4/mod.rs:5:42
[INFO] [stderr]   |
[INFO] [stderr] 5 |         for num_b in (num_a..99).step_by(-1) {
[INFO] [stderr]   |                                          ^^ cannot apply unary operator `-`
[INFO] [stderr]   |
[INFO] [stderr]   = note: unsigned values cannot be negated
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0600`.
[INFO] [stderr] error: Could not compile `project_euler`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0600]: cannot apply unary operator `-` to type `usize`
[INFO] [stderr]  --> src/problem_4/mod.rs:4:36
[INFO] [stderr]   |
[INFO] [stderr] 4 |     for num_a in (999..99).step_by(-1) {
[INFO] [stderr]   |                                    ^^ cannot apply unary operator `-`
[INFO] [stderr]   |
[INFO] [stderr]   = note: unsigned values cannot be negated
[INFO] [stderr] 
[INFO] [stderr] error[E0600]: cannot apply unary operator `-` to type `usize`
[INFO] [stderr]  --> src/problem_4/mod.rs:5:42
[INFO] [stderr]   |
[INFO] [stderr] 5 |         for num_b in (num_a..99).step_by(-1) {
[INFO] [stderr]   |                                          ^^ cannot apply unary operator `-`
[INFO] [stderr]   |
[INFO] [stderr]   = note: unsigned values cannot be negated
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0600`.
[INFO] [stderr] error: Could not compile `project_euler`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9fdf6c868d9e0935164cc5fd06f55478b9110a383c12b759504f3bff7012e7c8"`
[INFO] running `"docker" "rm" "-f" "9fdf6c868d9e0935164cc5fd06f55478b9110a383c12b759504f3bff7012e7c8"`
[INFO] [stdout] 9fdf6c868d9e0935164cc5fd06f55478b9110a383c12b759504f3bff7012e7c8