[INFO] updating cached repository https://github.com/colemickens/euler-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] 441b787ba2e0e5564f582f883e355782ece155e4
[INFO] checking colemickens/euler-rust against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolemickens%2Feuler-rust" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/colemickens/euler-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/colemickens/euler-rust
[INFO] finished tweaking git repo https://github.com/colemickens/euler-rust
[INFO] tweaked toml for git repo https://github.com/colemickens/euler-rust written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/colemickens/euler-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] [stderr] error: the lock file /mnt/big/crater/work/builds/worker-2/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-2/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-2/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] 621c5dd50fe2925d902629924427a7f7ecbada7371960e6adc180df2d3624574
[INFO] running `"docker" "start" "-a" "621c5dd50fe2925d902629924427a7f7ecbada7371960e6adc180df2d3624574"`
[INFO] [stderr]     Checking colemickens-euler-rust v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: type alias is never used: `Output`
[INFO] [stderr]  --> src/primes.rs:7:3
[INFO] [stderr]   |
[INFO] [stderr] 7 |   type Output = BigInt;
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Output`
[INFO] [stderr]  --> src/primes.rs:7:3
[INFO] [stderr]   |
[INFO] [stderr] 7 |   type Output = BigInt;
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `unused_variable`
[INFO] [stderr]   --> tests/problem011.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 | #[allow(unused_variable)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^ help: did you mean: `unused_variables`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unknown_lints)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unknown lint: `unused_variable`
[INFO] [stderr]   --> tests/problem011.rs:78:9
[INFO] [stderr]    |
[INFO] [stderr] 78 | #[allow(unused_variable)]
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^ help: did you mean: `unused_variables`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `grid`
[INFO] [stderr]   --> tests/problem011.rs:67:19
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn check_position(grid: Vec<Vec<u64>>, row_c: u64, col_c: u64, n: u64) -> u64 {
[INFO] [stderr]    |                   ^^^^ help: consider prefixing with an underscore: `_grid`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `row_c`
[INFO] [stderr]   --> tests/problem011.rs:67:40
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn check_position(grid: Vec<Vec<u64>>, row_c: u64, col_c: u64, n: u64) -> u64 {
[INFO] [stderr]    |                                        ^^^^^ help: consider prefixing with an underscore: `_row_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `col_c`
[INFO] [stderr]   --> tests/problem011.rs:67:52
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn check_position(grid: Vec<Vec<u64>>, row_c: u64, col_c: u64, n: u64) -> u64 {
[INFO] [stderr]    |                                                    ^^^^^ help: consider prefixing with an underscore: `_col_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> tests/problem011.rs:67:64
[INFO] [stderr]    |
[INFO] [stderr] 67 | fn check_position(grid: Vec<Vec<u64>>, row_c: u64, col_c: u64, n: u64) -> u64 {
[INFO] [stderr]    |                                                                ^ help: consider prefixing with an underscore: `_n`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `width`
[INFO] [stderr]   --> tests/problem011.rs:83:7
[INFO] [stderr]    |
[INFO] [stderr] 83 |   let width = grid.get(0).unwrap().len();
[INFO] [stderr]    |       ^^^^^ help: consider prefixing with an underscore: `_width`
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `convert`
[INFO] [stderr]   --> tests/problem011.rs:31:12
[INFO] [stderr]    |
[INFO] [stderr] 31 | #![feature(convert)]
[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 E0635`.
[INFO] [stderr] error: Could not compile `colemickens-euler-rust`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: the feature `iter_arith` has been stable since 1.11.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> tests/problem006.rs:15:12
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(iter_arith)]
[INFO] [stderr]    |            ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> tests/problem004.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 |   for i in (0u32..num_digits/2) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> tests/problem004.rs:25:12
[INFO] [stderr]    |
[INFO] [stderr] 25 |   for x in (1u64..upper_bound) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> tests/problem004.rs:26:14
[INFO] [stderr]    |
[INFO] [stderr] 26 |     for y in (1u64..x) {
[INFO] [stderr]    |              ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> tests/problem009.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 18 |   for a in (0u64..target) {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> tests/problem009.rs:19:14
[INFO] [stderr]    |
[INFO] [stderr] 19 |     for b in (0u64..a) {
[INFO] [stderr]    |              ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `iter_arith` has been stable since 1.11.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> tests/problem010.rs:9:12
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(iter_arith)]
[INFO] [stderr]   |            ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "621c5dd50fe2925d902629924427a7f7ecbada7371960e6adc180df2d3624574"`
[INFO] running `"docker" "rm" "-f" "621c5dd50fe2925d902629924427a7f7ecbada7371960e6adc180df2d3624574"`
[INFO] [stdout] 621c5dd50fe2925d902629924427a7f7ecbada7371960e6adc180df2d3624574