Sep 21 12:00:27.562 INFO checking concurrent-hashmap-0.2.2 against master#f7f4c500b46603386e940f116b469c7adc043a6d for pr-54394
Sep 21 12:00:27.562 INFO running: cargo +f7f4c500b46603386e940f116b469c7adc043a6d-alt check --frozen --all --all-targets
Sep 21 12:00:27.562 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-54394/master#f7f4c500b46603386e940f116b469c7adc043a6d:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54394/worker-3/master#f7f4c500b46603386e940f116b469c7adc043a6d:/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=1000" "-e" "CMD=cargo +f7f4c500b46603386e940f116b469c7adc043a6d-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "1536M" "crater"`
Sep 21 12:00:27.692 INFO blam! 9064335ba1ed73ec01479010ce3659a9f08d9351cba09600f53811ac4d0b6ce6
Sep 21 12:00:27.694 INFO running `"docker" "start" "-a" "9064335ba1ed73ec01479010ce3659a9f08d9351cba09600f53811ac4d0b6ce6"`
Sep 21 12:00:28.385 INFO kablam! usermod: no changes
Sep 21 12:00:28.417 INFO kablam!     Checking spin v0.4.8
Sep 21 12:00:28.571 INFO kablam!     Checking concurrent-hashmap v0.2.2 (/source)
Sep 21 12:00:29.518 INFO kablam! warning: variable does not need to be mutable
Sep 21 12:00:29.518 INFO kablam!    --> src/map.rs:537:13
Sep 21 12:00:29.518 INFO kablam!     |
Sep 21 12:00:29.518 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 21 12:00:29.518 INFO kablam!     |             ----^
Sep 21 12:00:29.518 INFO kablam!     |             |
Sep 21 12:00:29.518 INFO kablam!     |             help: remove this `mut`
Sep 21 12:00:29.528 INFO kablam!     |
Sep 21 12:00:29.528 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 21 12:00:29.528 INFO kablam! 
Sep 21 12:00:29.826 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 21 12:00:29.826 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 21 12:00:29.826 INFO kablam!   |
Sep 21 12:00:29.826 INFO kablam! 1 | #![feature(step_by)]
Sep 21 12:00:29.826 INFO kablam!   |            ^^^^^^^
Sep 21 12:00:29.826 INFO kablam! 
Sep 21 12:00:29.830 INFO kablam! error: aborting due to previous error
Sep 21 12:00:29.830 INFO kablam! 
Sep 21 12:00:29.830 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 21 12:00:29.834 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 21 12:00:29.834 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 21 12:00:30.181 INFO kablam! error: build failed
Sep 21 12:00:30.181 INFO kablam! su: No module specific data is present
Sep 21 12:00:31.014 INFO running `"docker" "rm" "-f" "9064335ba1ed73ec01479010ce3659a9f08d9351cba09600f53811ac4d0b6ce6"`
Sep 21 12:00:31.064 INFO blam! 9064335ba1ed73ec01479010ce3659a9f08d9351cba09600f53811ac4d0b6ce6