[INFO] crate rust-freqdist 0.1.5 is already in cache [INFO] extracting crate rust-freqdist 0.1.5 into work/ex/clippy-test-run/sources/stable/reg/rust-freqdist/0.1.5 [INFO] extracting crate rust-freqdist 0.1.5 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/rust-freqdist/0.1.5 [INFO] validating manifest of rust-freqdist-0.1.5 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 rust-freqdist-0.1.5 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 rust-freqdist-0.1.5 [INFO] finished frobbing rust-freqdist-0.1.5 [INFO] frobbed toml for rust-freqdist-0.1.5 written to work/ex/clippy-test-run/sources/stable/reg/rust-freqdist/0.1.5/Cargo.toml [INFO] started frobbing rust-freqdist-0.1.5 [INFO] finished frobbing rust-freqdist-0.1.5 [INFO] frobbed toml for rust-freqdist-0.1.5 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/rust-freqdist/0.1.5/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 rust-freqdist-0.1.5 against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-7/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/rust-freqdist/0.1.5:/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 -Dclippy::into_iter_on_array" "-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] b5b626c4c69859790f43e5db5cab351d3dbe98f6c44e27d54b6d9822bb9226ea [INFO] running `"docker" "start" "-a" "b5b626c4c69859790f43e5db5cab351d3dbe98f6c44e27d54b6d9822bb9226ea"` [INFO] [stderr] Checking rust-freqdist v0.1.5 (/opt/crater/workdir) [INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel [INFO] [stderr] --> src/lib.rs:29:19 [INFO] [stderr] | [INFO] [stderr] 29 | #![cfg_attr(test, feature(test))] [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 E0554`. [INFO] [stderr] error: Could not compile `rust-freqdist`. [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] warning: item `FrequencyDistribution` has a public `len` method but no corresponding `is_empty` method [INFO] [stderr] --> src/lib.rs:52:1 [INFO] [stderr] | [INFO] [stderr] 52 | / impl FrequencyDistribution [INFO] [stderr] 53 | | where K: Eq + Hash, [INFO] [stderr] 54 | | H: Hasher, [INFO] [stderr] 55 | | S: BuildHasher [INFO] [stderr] ... | [INFO] [stderr] 177 | | } [INFO] [stderr] 178 | | } [INFO] [stderr] | |_^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::len_without_is_empty)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty [INFO] [stderr] [INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let` [INFO] [stderr] --> src/lib.rs:159:5 [INFO] [stderr] | [INFO] [stderr] 159 | / match self.hashmap.remove(k) { [INFO] [stderr] 160 | | Some(count) => self.sum_counts -= count, [INFO] [stderr] 161 | | None => (), [INFO] [stderr] 162 | | } [INFO] [stderr] | |_____^ help: try this: `if let Some(count) = self.hashmap.remove(k) { self.sum_counts -= count }` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::single_match)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match [INFO] [stderr] [INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap` [INFO] [stderr] --> src/lib.rs:170:5 [INFO] [stderr] | [INFO] [stderr] 170 | / if !self.hashmap.contains_key(&k) { [INFO] [stderr] 171 | | self.hashmap.insert(k, incr); [INFO] [stderr] 172 | | } else { [INFO] [stderr] 173 | | *self.hashmap.get_mut(&k).unwrap() += incr; [INFO] [stderr] 174 | | } [INFO] [stderr] | |_____^ help: consider using: `self.hashmap.entry(k)` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::map_entry)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry [INFO] [stderr] [INFO] [stderr] error: build failed [INFO] running `"docker" "inspect" "b5b626c4c69859790f43e5db5cab351d3dbe98f6c44e27d54b6d9822bb9226ea"` [INFO] running `"docker" "rm" "-f" "b5b626c4c69859790f43e5db5cab351d3dbe98f6c44e27d54b6d9822bb9226ea"` [INFO] [stdout] b5b626c4c69859790f43e5db5cab351d3dbe98f6c44e27d54b6d9822bb9226ea