[INFO] crate flat_map 0.0.8 is already in cache
[INFO] checking flat_map-0.0.8 against master#2da942f32802c8233a09744024dfbc34431adf65 for pr-66963
[INFO] extracting crate flat_map 0.0.8 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate flat_map 0.0.8 on toolchain 2da942f32802c8233a09744024dfbc34431adf65
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2da942f32802c8233a09744024dfbc34431adf65" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate flat_map 0.0.8
[INFO] finished tweaking crates.io crate flat_map 0.0.8
[INFO] tweaked toml for crates.io crate flat_map 0.0.8 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2da942f32802c8233a09744024dfbc34431adf65" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2da942f32802c8233a09744024dfbc34431adf65" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "/opt/rustwide/cargo-home/bin/cargo" "+2da942f32802c8233a09744024dfbc34431adf65" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 418ca50bf4c1ffa2b31e844ed0116bffb5c57fdd8ccae155ef88e996dd4fd10c
[INFO] running `"docker" "start" "-a" "418ca50bf4c1ffa2b31e844ed0116bffb5c57fdd8ccae155ef88e996dd4fd10c"`
[INFO] [stderr]     Checking flat_map v0.0.8 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/flat_map.rs:450:34
[INFO] [stderr]     |
[INFO] [stderr] 450 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stderr]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/flat_map.rs:459:39
[INFO] [stderr]     |
[INFO] [stderr] 459 |     fn next_back(&mut self) -> Option<(&'a K)> {
[INFO] [stderr]     |                                       ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/flat_map.rs:477:34
[INFO] [stderr]     |
[INFO] [stderr] 477 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stderr]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/flat_map.rs:486:39
[INFO] [stderr]     |
[INFO] [stderr] 486 |     fn next_back(&mut self) -> Option<(&'a V)> {
[INFO] [stderr]     |                                       ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/flat_map.rs:450:34
[INFO] [stderr]     |
[INFO] [stderr] 450 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stderr]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/flat_map.rs:459:39
[INFO] [stderr]     |
[INFO] [stderr] 459 |     fn next_back(&mut self) -> Option<(&'a K)> {
[INFO] [stderr]     |                                       ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/flat_map.rs:477:34
[INFO] [stderr]     |
[INFO] [stderr] 477 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stderr]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/flat_map.rs:486:39
[INFO] [stderr]     |
[INFO] [stderr] 486 |     fn next_back(&mut self) -> Option<(&'a V)> {
[INFO] [stderr]     |                                       ^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `"docker" "inspect" "418ca50bf4c1ffa2b31e844ed0116bffb5c57fdd8ccae155ef88e996dd4fd10c"`
[INFO] running `"docker" "rm" "-f" "418ca50bf4c1ffa2b31e844ed0116bffb5c57fdd8ccae155ef88e996dd4fd10c"`
[INFO] [stdout] 418ca50bf4c1ffa2b31e844ed0116bffb5c57fdd8ccae155ef88e996dd4fd10c