[INFO] crate multimap 0.4.0 is already in cache
[INFO] extracting crate multimap 0.4.0 into work/ex/clippy-test-run/sources/stable/reg/multimap/0.4.0
[INFO] extracting crate multimap 0.4.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/multimap/0.4.0
[INFO] validating manifest of multimap-0.4.0 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 multimap-0.4.0 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 multimap-0.4.0
[INFO] finished frobbing multimap-0.4.0
[INFO] frobbed toml for multimap-0.4.0 written to work/ex/clippy-test-run/sources/stable/reg/multimap/0.4.0/Cargo.toml
[INFO] started frobbing multimap-0.4.0
[INFO] finished frobbing multimap-0.4.0
[INFO] frobbed toml for multimap-0.4.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/multimap/0.4.0/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 multimap-0.4.0 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-4/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/multimap/0.4.0:/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] a305e34cec2e9dd19ee87f693a56cc8b5fec7eb5ac5733d2d5029cccf9c22120
[INFO] running `"docker" "start" "-a" "a305e34cec2e9dd19ee87f693a56cc8b5fec7eb5ac5733d2d5029cccf9c22120"`
[INFO] [stderr]     Checking multimap v0.4.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:249:36
[INFO] [stderr]     |
[INFO] [stderr] 249 |         self.inner.get_mut(k).map(|mut v| v.get_mut(0).unwrap())
[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/lib.rs:590:18
[INFO] [stderr]     |
[INFO] [stderr] 590 |     fn into_iter(mut self) -> IterAllMut<'a, K, Vec<V>> {
[INFO] [stderr]     |                  ----^^^^
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get_mut().unwrap()` on a slice. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/lib.rs:249:43
[INFO] [stderr]     |
[INFO] [stderr] 249 |         self.inner.get_mut(k).map(|mut v| v.get_mut(0).unwrap())
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut v[0]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:249:36
[INFO] [stderr]     |
[INFO] [stderr] 249 |         self.inner.get_mut(k).map(|mut v| v.get_mut(0).unwrap())
[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/lib.rs:590:18
[INFO] [stderr]     |
[INFO] [stderr] 590 |     fn into_iter(mut self) -> IterAllMut<'a, K, Vec<V>> {
[INFO] [stderr]     |                  ----^^^^
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:1112:17
[INFO] [stderr]      |
[INFO] [stderr] 1112 |             let mut v = m.entry(1).or_insert(43);
[INFO] [stderr]      |                 ----^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:1128:17
[INFO] [stderr]      |
[INFO] [stderr] 1128 |             let mut v = m.entry(1).or_insert_vec(vec![43]);
[INFO] [stderr]      |                 ----^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get_mut().unwrap()` on a slice. Using `[]` is more clear and more concise
[INFO] [stderr]    --> src/lib.rs:249:43
[INFO] [stderr]     |
[INFO] [stderr] 249 |         self.inner.get_mut(k).map(|mut v| v.get_mut(0).unwrap())
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^ help: try this: `&mut v[0]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: statement with no effect
[INFO] [stderr]    --> src/lib.rs:767:9
[INFO] [stderr]     |
[INFO] [stderr] 767 |         &m[&1];
[INFO] [stderr]     |         ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::no_effect)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#no_effect
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.58s
[INFO] running `"docker" "inspect" "a305e34cec2e9dd19ee87f693a56cc8b5fec7eb5ac5733d2d5029cccf9c22120"`
[INFO] running `"docker" "rm" "-f" "a305e34cec2e9dd19ee87f693a56cc8b5fec7eb5ac5733d2d5029cccf9c22120"`
[INFO] [stdout] a305e34cec2e9dd19ee87f693a56cc8b5fec7eb5ac5733d2d5029cccf9c22120