[INFO] crate drop_guard 0.2.1 is already in cache
[INFO] extracting crate drop_guard 0.2.1 into work/ex/clippy-test-run/sources/stable/reg/drop_guard/0.2.1
[INFO] extracting crate drop_guard 0.2.1 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/drop_guard/0.2.1
[INFO] validating manifest of drop_guard-0.2.1 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 drop_guard-0.2.1 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 drop_guard-0.2.1
[INFO] finished frobbing drop_guard-0.2.1
[INFO] frobbed toml for drop_guard-0.2.1 written to work/ex/clippy-test-run/sources/stable/reg/drop_guard/0.2.1/Cargo.toml
[INFO] started frobbing drop_guard-0.2.1
[INFO] finished frobbing drop_guard-0.2.1
[INFO] frobbed toml for drop_guard-0.2.1 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/drop_guard/0.2.1/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 drop_guard-0.2.1 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-5/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/drop_guard/0.2.1:/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] 10a90a67b3f679c5115c5a57dd8ea9bac4b690713439aa16e5f04c893e86c714
[INFO] running `"docker" "start" "-a" "10a90a67b3f679c5115c5a57dd8ea9bac4b690713439aa16e5f04c893e86c714"`
[INFO] [stderr]     Checking drop_guard v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]    --> src/lib.rs:134:13
[INFO] [stderr]     |
[INFO] [stderr] 134 |         let ref mut f = self.func;
[INFO] [stderr]     |         ----^^^^^^^^^------------- help: try: `let f = &mut self.func;`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]    --> src/lib.rs:134:13
[INFO] [stderr]     |
[INFO] [stderr] 134 |         let ref mut f = self.func;
[INFO] [stderr]     |         ----^^^^^^^^^------------- help: try: `let f = &mut self.func;`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.69s
[INFO] running `"docker" "inspect" "10a90a67b3f679c5115c5a57dd8ea9bac4b690713439aa16e5f04c893e86c714"`
[INFO] running `"docker" "rm" "-f" "10a90a67b3f679c5115c5a57dd8ea9bac4b690713439aa16e5f04c893e86c714"`
[INFO] [stdout] 10a90a67b3f679c5115c5a57dd8ea9bac4b690713439aa16e5f04c893e86c714