Sep 02 00:09:38.238 INFO checking concurrent-hashmap-0.2.2 against master#1114ab684fbad001c4e580326d8eb4d8c4e917d3 for pr-53831
Sep 02 00:09:38.238 INFO running: cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets
Sep 02 00:09:38.239 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-53831/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53831/worker-3/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 00:09:38.440 INFO blam! b787eac050579965e1c8058925eea0dfee32a6b7a6e836d5d9fd26a762dde088
Sep 02 00:09:38.442 INFO running `"docker" "start" "-a" "b787eac050579965e1c8058925eea0dfee32a6b7a6e836d5d9fd26a762dde088"`
Sep 02 00:09:39.472 INFO kablam!     Checking concurrent-hashmap v0.2.2 (file:///source)
Sep 02 00:09:41.471 INFO kablam! warning: variable does not need to be mutable
Sep 02 00:09:41.472 INFO kablam!    --> src/map.rs:537:13
Sep 02 00:09:41.472 INFO kablam!     |
Sep 02 00:09:41.472 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 02 00:09:41.472 INFO kablam!     |             ----^
Sep 02 00:09:41.472 INFO kablam!     |             |
Sep 02 00:09:41.472 INFO kablam!     |             help: remove this `mut`
Sep 02 00:09:41.472 INFO kablam!     |
Sep 02 00:09:41.472 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 02 00:09:41.472 INFO kablam! 
Sep 02 00:09:42.169 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 02 00:09:42.169 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 02 00:09:42.169 INFO kablam!   |
Sep 02 00:09:42.169 INFO kablam! 1 | #![feature(step_by)]
Sep 02 00:09:42.169 INFO kablam!   |            ^^^^^^^
Sep 02 00:09:42.169 INFO kablam! 
Sep 02 00:09:42.173 INFO kablam! error: aborting due to previous error
Sep 02 00:09:42.173 INFO kablam! 
Sep 02 00:09:42.173 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 02 00:09:42.181 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 02 00:09:42.181 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 02 00:09:42.516 INFO kablam! error: build failed
Sep 02 00:09:42.517 INFO kablam! su: No module specific data is present
Sep 02 00:09:42.954 INFO running `"docker" "rm" "-f" "b787eac050579965e1c8058925eea0dfee32a6b7a6e836d5d9fd26a762dde088"`
Sep 02 00:09:43.058 INFO blam! b787eac050579965e1c8058925eea0dfee32a6b7a6e836d5d9fd26a762dde088