[INFO] updating cached repository https://github.com/Bech1337/programming_language
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8458b6fc013917f4d80517f7526f63f7865f89f4
[INFO] checking Bech1337/programming_language against master#e1beee4992ad4b235fc700bf7af1ee86f894ea53 for pr-74130
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBech1337%2Fprogramming_language" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Bech1337/programming_language on toolchain e1beee4992ad4b235fc700bf7af1ee86f894ea53
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e1beee4992ad4b235fc700bf7af1ee86f894ea53" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Bech1337/programming_language
[INFO] finished tweaking git repo https://github.com/Bech1337/programming_language
[INFO] tweaked toml for git repo https://github.com/Bech1337/programming_language written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/Bech1337/programming_language already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+e1beee4992ad4b235fc700bf7af1ee86f894ea53" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+e1beee4992ad4b235fc700bf7af1ee86f894ea53" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 133c380ae645872f7ce550dba0a2ca33494b0b8a8ec14684f0af6f0751ddd3db
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "133c380ae645872f7ce550dba0a2ca33494b0b8a8ec14684f0af6f0751ddd3db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "133c380ae645872f7ce550dba0a2ca33494b0b8a8ec14684f0af6f0751ddd3db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "133c380ae645872f7ce550dba0a2ca33494b0b8a8ec14684f0af6f0751ddd3db", kill_on_drop: false }`
[INFO] [stdout] 133c380ae645872f7ce550dba0a2ca33494b0b8a8ec14684f0af6f0751ddd3db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:819119df93c0f5eca3f29186f14981ef29945a311854d7222af07488600a2584" "/opt/rustwide/cargo-home/bin/cargo" "+e1beee4992ad4b235fc700bf7af1ee86f894ea53" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7503fbd19edabccb1744f73f6fd4e5a70b9636e5cb98db906cf65a9f8600c59e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7503fbd19edabccb1744f73f6fd4e5a70b9636e5cb98db906cf65a9f8600c59e", kill_on_drop: false }`
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking regex-syntax v0.6.17
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking regex v1.3.7
[INFO] [stderr]     Checking compiler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `test_string`
[INFO] [stdout]  --> src/lexer/is.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut test_string = char::to_string(&chars[index]);
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_test_string`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keywords`
[INFO] [stdout]  --> src/lexer/is.rs:2:56
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn is_keyword(mut index: usize, chars: &Vec<char>, keywords: &Vec<&str>) -> bool {
[INFO] [stdout]   |                                                        ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_keywords`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/lexer/is.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut test_string = char::to_string(&chars[index]);
[INFO] [stdout]   |         ----^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `test_string`
[INFO] [stdout]  --> src/lexer/is.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut test_string = char::to_string(&chars[index]);
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_test_string`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keywords`
[INFO] [stdout]  --> src/lexer/is.rs:2:56
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub fn is_keyword(mut index: usize, chars: &Vec<char>, keywords: &Vec<&str>) -> bool {
[INFO] [stdout]   |                                                        ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_keywords`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/lexer/is.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let mut test_string = char::to_string(&chars[index]);
[INFO] [stdout]   |         ----^^^^^^^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.79s
[INFO] running `Command { std: "docker" "inspect" "7503fbd19edabccb1744f73f6fd4e5a70b9636e5cb98db906cf65a9f8600c59e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7503fbd19edabccb1744f73f6fd4e5a70b9636e5cb98db906cf65a9f8600c59e", kill_on_drop: false }`
[INFO] [stdout] 7503fbd19edabccb1744f73f6fd4e5a70b9636e5cb98db906cf65a9f8600c59e