Sep 02 17:44:08.847 INFO checking concurrent-hashmap-0.2.2 against master#1114ab684fbad001c4e580326d8eb4d8c4e917d3 for pr-53851
Sep 02 17:44:08.847 INFO running: cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets
Sep 02 17:44:08.847 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53851/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53851/worker-0/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/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 +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 02 17:44:08.993 INFO blam! 2b619c60f79206e526c15032e35f39a3ea35bd3cbeb54847cdc2b5319933f5a2
Sep 02 17:44:08.995 INFO running `"docker" "start" "-a" "2b619c60f79206e526c15032e35f39a3ea35bd3cbeb54847cdc2b5319933f5a2"`
Sep 02 17:44:09.687 INFO kablam!     Checking concurrent-hashmap v0.2.2 (file:///source)
Sep 02 17:44:11.401 INFO kablam! warning: variable does not need to be mutable
Sep 02 17:44:11.401 INFO kablam!    --> src/map.rs:537:13
Sep 02 17:44:11.402 INFO kablam!     |
Sep 02 17:44:11.402 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 02 17:44:11.402 INFO kablam!     |             ----^
Sep 02 17:44:11.402 INFO kablam!     |             |
Sep 02 17:44:11.402 INFO kablam!     |             help: remove this `mut`
Sep 02 17:44:11.402 INFO kablam!     |
Sep 02 17:44:11.403 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 02 17:44:11.403 INFO kablam! 
Sep 02 17:44:12.856 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 02 17:44:12.856 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 02 17:44:12.856 INFO kablam!   |
Sep 02 17:44:12.856 INFO kablam! 1 | #![feature(step_by)]
Sep 02 17:44:12.856 INFO kablam!   |            ^^^^^^^
Sep 02 17:44:12.856 INFO kablam! 
Sep 02 17:44:12.861 INFO kablam! error: aborting due to previous error
Sep 02 17:44:12.861 INFO kablam! 
Sep 02 17:44:12.861 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 02 17:44:12.868 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 02 17:44:12.868 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 02 17:44:13.174 INFO kablam! error: build failed
Sep 02 17:44:13.175 INFO kablam! su: No module specific data is present
Sep 02 17:44:13.606 INFO running `"docker" "rm" "-f" "2b619c60f79206e526c15032e35f39a3ea35bd3cbeb54847cdc2b5319933f5a2"`
Sep 02 17:44:13.701 INFO blam! 2b619c60f79206e526c15032e35f39a3ea35bd3cbeb54847cdc2b5319933f5a2