[INFO] fetching crate concurrent-hashmap 0.2.2...
[INFO] extracting crate concurrent-hashmap 0.2.2 into work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/concurrent-hashmap/0.2.2
[INFO] extracting crate concurrent-hashmap 0.2.2 into work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/concurrent-hashmap/0.2.2
[INFO] validating manifest of concurrent-hashmap-0.2.2 on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of concurrent-hashmap-0.2.2 on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing concurrent-hashmap-0.2.2
[INFO] finished frobbing concurrent-hashmap-0.2.2
[INFO] frobbed toml for concurrent-hashmap-0.2.2 written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/concurrent-hashmap/0.2.2/Cargo.toml
[INFO] started frobbing concurrent-hashmap-0.2.2
[INFO] finished frobbing concurrent-hashmap-0.2.2
[INFO] frobbed toml for concurrent-hashmap-0.2.2 written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/reg/concurrent-hashmap/0.2.2/Cargo.toml
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking concurrent-hashmap-0.2.2 against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-4/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/reg/concurrent-hashmap/0.2.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 52dee70fa877c1d47a27d07fede77a06d7d9822292e670dbb9dc0e345ee20d65
[INFO] running `"docker" "start" "-a" "52dee70fa877c1d47a27d07fede77a06d7d9822292e670dbb9dc0e345ee20d65"`
[INFO] [stderr]     Checking spin v0.4.8
[INFO] [stderr]     Checking concurrent-hashmap v0.2.2 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/map.rs:537:13
[INFO] [stderr]     |
[INFO] [stderr] 537 |         let mut e = map.find_mut(&1).unwrap().get();
[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/map.rs:561:21
[INFO] [stderr]     |
[INFO] [stderr] 561 |                 let mut e = tl_map.find_mut(&i).unwrap().get();
[INFO] [stderr]     |                     ----^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] error[E0635]: unknown feature `step_by`
[INFO] [stderr]  --> examples/wordcount.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(step_by)]
[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 E0635`.
[INFO] [stderr] error: Could not compile `concurrent-hashmap`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "52dee70fa877c1d47a27d07fede77a06d7d9822292e670dbb9dc0e345ee20d65"`
[INFO] running `"docker" "rm" "-f" "52dee70fa877c1d47a27d07fede77a06d7d9822292e670dbb9dc0e345ee20d65"`
[INFO] [stdout] 52dee70fa877c1d47a27d07fede77a06d7d9822292e670dbb9dc0e345ee20d65