[INFO] updating cached repository https://github.com/tynr426/mod_learn
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/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] abcef15e23338acfb159bf1a6fcfbcc2a7f1ceec
[INFO] checking tynr426/mod_learn against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftynr426%2Fmod_learn" "/workspace/builds/worker-9/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tynr426/mod_learn on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/tynr426/mod_learn
[INFO] finished tweaking git repo https://github.com/tynr426/mod_learn
[INFO] tweaked toml for git repo https://github.com/tynr426/mod_learn written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/tynr426/mod_learn already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 817405682fadad8c8a2defe20edb80068fa17933ac681c8bac6ceb2371b6d05c
[INFO] running `"docker" "start" "-a" "817405682fadad8c8a2defe20edb80068fa17933ac681c8bac6ceb2371b6d05c"`
[INFO] [stderr]     Checking mod_learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/main.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let none = match_crate::plus_one(None);
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hello`
[INFO] [stderr]  --> src/japanese/greetings.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn hello() -> String {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `goodbye`
[INFO] [stderr]  --> src/japanese/farewells.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub  fn goodbye() -> String {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]  --> src/match_crate.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |         Alabama,
[INFO] [stderr]   |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Penny`
[INFO] [stderr]  --> src/match_crate.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Penny,
[INFO] [stderr]   |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]   --> src/match_crate.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |         Nickel,
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]   --> src/match_crate.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |         Dime,
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `none`
[INFO] [stderr]   --> src/main.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let none = match_crate::plus_one(None);
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_none`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hello`
[INFO] [stderr]  --> src/japanese/greetings.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn hello() -> String {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `goodbye`
[INFO] [stderr]  --> src/japanese/farewells.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub  fn goodbye() -> String {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]  --> src/match_crate.rs:4:9
[INFO] [stderr]   |
[INFO] [stderr] 4 |         Alabama,
[INFO] [stderr]   |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Penny`
[INFO] [stderr]  --> src/match_crate.rs:9:9
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Penny,
[INFO] [stderr]   |         ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]   --> src/match_crate.rs:10:9
[INFO] [stderr]    |
[INFO] [stderr] 10 |         Nickel,
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]   --> src/match_crate.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 |         Dime,
[INFO] [stderr]    |         ^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.99s
[INFO] running `"docker" "inspect" "817405682fadad8c8a2defe20edb80068fa17933ac681c8bac6ceb2371b6d05c"`
[INFO] running `"docker" "rm" "-f" "817405682fadad8c8a2defe20edb80068fa17933ac681c8bac6ceb2371b6d05c"`
[INFO] [stdout] 817405682fadad8c8a2defe20edb80068fa17933ac681c8bac6ceb2371b6d05c