[INFO] updating cached repository https://github.com/rcoverick/rust_dailyprogrammer
[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] 7eba5007eb1ec145617b2771d020da0663dd7473
[INFO] checking rcoverick/rust_dailyprogrammer against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Frcoverick%2Frust_dailyprogrammer" "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/rcoverick/rust_dailyprogrammer 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/rcoverick/rust_dailyprogrammer
[INFO] finished tweaking git repo https://github.com/rcoverick/rust_dailyprogrammer
[INFO] tweaked toml for git repo https://github.com/rcoverick/rust_dailyprogrammer written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/rcoverick/rust_dailyprogrammer 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-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] 6f25dde7e9ddeb41993e924bbefc86f4819de23ca1d8f12fa1c250457f62eb99
[INFO] running `"docker" "start" "-a" "6f25dde7e9ddeb41993e924bbefc86f4819de23ca1d8f12fa1c250457f62eb99"`
[INFO] [stderr]     Checking dailyprogrammer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/challenge/easy/pandigital_roman_numbers.rs:3:5
[INFO] [stderr]    |
[INFO] [stderr] 3  | /     ///Numerals need to be in order. Each pair of numerals can be swapped to form a different number. 
[INFO] [stderr] 4  | |     ///M+(DC or CD)+(LX or XL)+(VI or IV) = a pandigital roman numeral with all of the numerals exactly once  
[INFO] [stderr]    | |______________________________________________________________________________________________________________^
[INFO] [stderr] 5  | /     for m in [1000].into_iter(){
[INFO] [stderr] 6  | |         for cd in [400, 600].into_iter(){
[INFO] [stderr] 7  | |             for xl in [40,60].into_iter(){
[INFO] [stderr] 8  | |                 for  iv in [4,6].into_iter(){
[INFO] [stderr] ...  |
[INFO] [stderr] 12 | |         }
[INFO] [stderr] 13 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/challenge/easy/pandigital_roman_numbers.rs:3:5
[INFO] [stderr]    |
[INFO] [stderr] 3  | /     ///Numerals need to be in order. Each pair of numerals can be swapped to form a different number. 
[INFO] [stderr] 4  | |     ///M+(DC or CD)+(LX or XL)+(VI or IV) = a pandigital roman numeral with all of the numerals exactly once  
[INFO] [stderr]    | |______________________________________________________________________________________________________________^
[INFO] [stderr] 5  | /     for m in [1000].into_iter(){
[INFO] [stderr] 6  | |         for cd in [400, 600].into_iter(){
[INFO] [stderr] 7  | |             for xl in [40,60].into_iter(){
[INFO] [stderr] 8  | |                 for  iv in [4,6].into_iter(){
[INFO] [stderr] ...  |
[INFO] [stderr] 12 | |         }
[INFO] [stderr] 13 | |     }
[INFO] [stderr]    | |_____- rustdoc does not generate documentation for expressions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around method argument
[INFO] [stderr]   --> src/challenge/intermediate/pgm_manipulation.rs:20:32
[INFO] [stderr]    |
[INFO] [stderr] 20 |     io::stdin().read_to_string((&mut buf)).unwrap();
[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 method argument
[INFO] [stderr]   --> src/challenge/intermediate/pgm_manipulation.rs:20:32
[INFO] [stderr]    |
[INFO] [stderr] 20 |     io::stdin().read_to_string((&mut buf)).unwrap();
[INFO] [stderr]    |                                ^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/challenge/intermediate/pgm_manipulation.rs:38:41
[INFO] [stderr]    |
[INFO] [stderr] 38 |     res.chunks_mut(width as usize).map(|mut x| x.reverse()).count();
[INFO] [stderr]    |                                         ----^
[INFO] [stderr]    |                                         |
[INFO] [stderr]    |                                         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/challenge/intermediate/pgm_manipulation.rs:38:41
[INFO] [stderr]    |
[INFO] [stderr] 38 |     res.chunks_mut(width as usize).map(|mut x| x.reverse()).count();
[INFO] [stderr]    |                                         ----^
[INFO] [stderr]    |                                         |
[INFO] [stderr]    |                                         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.78s
[INFO] running `"docker" "inspect" "6f25dde7e9ddeb41993e924bbefc86f4819de23ca1d8f12fa1c250457f62eb99"`
[INFO] running `"docker" "rm" "-f" "6f25dde7e9ddeb41993e924bbefc86f4819de23ca1d8f12fa1c250457f62eb99"`
[INFO] [stdout] 6f25dde7e9ddeb41993e924bbefc86f4819de23ca1d8f12fa1c250457f62eb99