[INFO] updating cached repository https://github.com/robinsonj/project_euler
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/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] ba494a87e0c8f114cd0c9654564a56559da8d47d
[INFO] testing robinsonj/project_euler against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Frobinsonj%2Fproject_euler" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/robinsonj/project_euler on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/robinsonj/project_euler
[INFO] finished tweaking git repo https://github.com/robinsonj/project_euler
[INFO] tweaked toml for git repo https://github.com/robinsonj/project_euler written to work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/robinsonj/project_euler already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/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=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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] fc14e2da336e7ece7c839a961ddbcf10c49f83bb0a1b3b195b6a1078a6e55eb1
[INFO] running `"docker" "start" "-a" "fc14e2da336e7ece7c839a961ddbcf10c49f83bb0a1b3b195b6a1078a6e55eb1"`
[INFO] [stderr]    Compiling euler_lib v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/math/primes/mod.rs:151:7
[INFO] [stderr]     |
[INFO] [stderr] 151 |     2 ... 3         => true,
[INFO] [stderr]     |       ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `file_name`
[INFO] [stderr]   --> src/solver/mod.rs:39:40
[INFO] [stderr]    |
[INFO] [stderr] 39 |       SolverFunction::FunctionWithFile(file_name, solve) => {
[INFO] [stderr]    |                                        ^^^^^^^^^ help: consider prefixing with an underscore: `_file_name`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `FunctionWithFile`
[INFO] [stderr]  --> src/solver/mod.rs:3:3
[INFO] [stderr]   |
[INFO] [stderr] 3 |   FunctionWithFile(&'a str, fn() -> String)
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/bin/p012.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(test)]
[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 E0554`.
[INFO] [stderr] error: Could not compile `euler_lib`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "fc14e2da336e7ece7c839a961ddbcf10c49f83bb0a1b3b195b6a1078a6e55eb1"`
[INFO] running `"docker" "rm" "-f" "fc14e2da336e7ece7c839a961ddbcf10c49f83bb0a1b3b195b6a1078a6e55eb1"`
[INFO] [stdout] fc14e2da336e7ece7c839a961ddbcf10c49f83bb0a1b3b195b6a1078a6e55eb1