Sep 04 21:03:39.438 INFO checking concurrent-hashmap-0.2.2 against master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c for pr-53893
Sep 04 21:03:39.438 INFO running: cargo +28bcffead74d5e17c6cb1f7de432e37f93a6b50c-alt check --frozen --all --all-targets
Sep 04 21:03:39.438 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-53893/master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53893/worker-2/master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c:/target:rw,Z" "-v" "/home/ec2-user/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/home/ec2-user/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=500" "-e" "CMD=cargo +28bcffead74d5e17c6cb1f7de432e37f93a6b50c-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 04 21:03:39.654 INFO blam! de7210ddc5de9fb1fcbf386dc568c9361d5edf35bb2f98476d249e9fbdcae3de
Sep 04 21:03:39.656 INFO running `"docker" "start" "-a" "de7210ddc5de9fb1fcbf386dc568c9361d5edf35bb2f98476d249e9fbdcae3de"`
Sep 04 21:03:40.742 INFO kablam!     Checking spin v0.4.8
Sep 04 21:03:41.078 INFO kablam!     Checking concurrent-hashmap v0.2.2 (file:///source)
Sep 04 21:03:43.086 INFO kablam! warning: variable does not need to be mutable
Sep 04 21:03:43.086 INFO kablam!    --> src/map.rs:537:13
Sep 04 21:03:43.086 INFO kablam!     |
Sep 04 21:03:43.086 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 04 21:03:43.086 INFO kablam!     |             ----^
Sep 04 21:03:43.086 INFO kablam!     |             |
Sep 04 21:03:43.086 INFO kablam!     |             help: remove this `mut`
Sep 04 21:03:43.086 INFO kablam!     |
Sep 04 21:03:43.086 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 04 21:03:43.086 INFO kablam! 
Sep 04 21:03:43.676 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 04 21:03:43.676 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 04 21:03:43.676 INFO kablam!   |
Sep 04 21:03:43.676 INFO kablam! 1 | #![feature(step_by)]
Sep 04 21:03:43.676 INFO kablam!   |            ^^^^^^^
Sep 04 21:03:43.677 INFO kablam! 
Sep 04 21:03:43.682 INFO kablam! error: aborting due to previous error
Sep 04 21:03:43.682 INFO kablam! 
Sep 04 21:03:43.682 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 04 21:03:43.691 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 04 21:03:43.691 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 04 21:03:44.038 INFO kablam! error: build failed
Sep 04 21:03:44.039 INFO kablam! su: No module specific data is present
Sep 04 21:03:44.407 INFO running `"docker" "rm" "-f" "de7210ddc5de9fb1fcbf386dc568c9361d5edf35bb2f98476d249e9fbdcae3de"`
Sep 04 21:03:44.496 INFO blam! de7210ddc5de9fb1fcbf386dc568c9361d5edf35bb2f98476d249e9fbdcae3de