[INFO] crate ttl_cache 0.5.1 is already in cache
[INFO] extracting crate ttl_cache 0.5.1 into work/ex/clippy-test-run/sources/stable/reg/ttl_cache/0.5.1
[INFO] extracting crate ttl_cache 0.5.1 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/ttl_cache/0.5.1
[INFO] validating manifest of ttl_cache-0.5.1 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ttl_cache-0.5.1 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ttl_cache-0.5.1
[INFO] finished frobbing ttl_cache-0.5.1
[INFO] frobbed toml for ttl_cache-0.5.1 written to work/ex/clippy-test-run/sources/stable/reg/ttl_cache/0.5.1/Cargo.toml
[INFO] started frobbing ttl_cache-0.5.1
[INFO] finished frobbing ttl_cache-0.5.1
[INFO] frobbed toml for ttl_cache-0.5.1 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/ttl_cache/0.5.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting ttl_cache-0.5.1 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-2/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/ttl_cache/0.5.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 007b55f448841743dfbfd335a6d51c2bb49ed1664ebfbfeea6a4ec9203563785
[INFO] running `"docker" "start" "-a" "007b55f448841743dfbfd335a6d51c2bb49ed1664ebfbfeea6a4ec9203563785"`
[INFO] [stderr]     Checking ttl_cache v0.5.1 (/opt/crater/workdir)
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]    --> src/lib.rs:260:9
[INFO] [stderr]     |
[INFO] [stderr] 260 |         to_ret
[INFO] [stderr]     |         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::let_and_return)] on by default
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]    --> src/lib.rs:249:22
[INFO] [stderr]     |
[INFO] [stderr] 249 |           let to_ret = self.map
[INFO] [stderr]     |  ______________________^
[INFO] [stderr] 250 | |             .get(k)
[INFO] [stderr] 251 | |             .and_then(|x| if x.is_expired() { None } else { Some(&x.value) });
[INFO] [stderr]     | |_____________________________________________________________________________^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]    --> src/lib.rs:303:9
[INFO] [stderr]     |
[INFO] [stderr] 303 |         to_ret
[INFO] [stderr]     |         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]    --> src/lib.rs:288:22
[INFO] [stderr]     |
[INFO] [stderr] 288 |           let to_ret = self.map.get_mut(k).and_then(|x| {
[INFO] [stderr]     |  ______________________^
[INFO] [stderr] 289 | |             if x.is_expired() {
[INFO] [stderr] 290 | |                 None
[INFO] [stderr] 291 | |             } else {
[INFO] [stderr] 292 | |                 Some(&mut x.value)
[INFO] [stderr] 293 | |             }
[INFO] [stderr] 294 | |         });
[INFO] [stderr]     | |__________^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]    --> src/lib.rs:260:9
[INFO] [stderr]     |
[INFO] [stderr] 260 |         to_ret
[INFO] [stderr]     |         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::let_and_return)] on by default
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]    --> src/lib.rs:249:22
[INFO] [stderr]     |
[INFO] [stderr] 249 |           let to_ret = self.map
[INFO] [stderr]     |  ______________________^
[INFO] [stderr] 250 | |             .get(k)
[INFO] [stderr] 251 | |             .and_then(|x| if x.is_expired() { None } else { Some(&x.value) });
[INFO] [stderr]     | |_____________________________________________________________________________^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]    --> src/lib.rs:303:9
[INFO] [stderr]     |
[INFO] [stderr] 303 |         to_ret
[INFO] [stderr]     |         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]    --> src/lib.rs:288:22
[INFO] [stderr]     |
[INFO] [stderr] 288 |           let to_ret = self.map.get_mut(k).and_then(|x| {
[INFO] [stderr]     |  ______________________^
[INFO] [stderr] 289 | |             if x.is_expired() {
[INFO] [stderr] 290 | |                 None
[INFO] [stderr] 291 | |             } else {
[INFO] [stderr] 292 | |                 Some(&mut x.value)
[INFO] [stderr] 293 | |             }
[INFO] [stderr] 294 | |         });
[INFO] [stderr]     | |__________^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: called `map(f)` on an Option value where `f` is a unit closure
[INFO] [stderr]   --> tests/test.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     cache.get_mut(&1).map(|v| *v = 20);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
[INFO] [stderr]    |     |
[INFO] [stderr]    |     help: try this: `if let Some(v) = cache.get_mut(&1) { ... }`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::option_map_unit_fn)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#option_map_unit_fn
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.88s
[INFO] running `"docker" "inspect" "007b55f448841743dfbfd335a6d51c2bb49ed1664ebfbfeea6a4ec9203563785"`
[INFO] running `"docker" "rm" "-f" "007b55f448841743dfbfd335a6d51c2bb49ed1664ebfbfeea6a4ec9203563785"`
[INFO] [stdout] 007b55f448841743dfbfd335a6d51c2bb49ed1664ebfbfeea6a4ec9203563785