Sep 18 02:19:17.141 INFO checking concurrent-hashmap-0.2.2 against try#cfeeefe83c83bceb55d60d7e2be173db7597ed50 for pr-54033
Sep 18 02:19:17.141 INFO running: cargo +cfeeefe83c83bceb55d60d7e2be173db7597ed50-alt check --frozen --all --all-targets
Sep 18 02:19:17.141 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-54033/try#cfeeefe83c83bceb55d60d7e2be173db7597ed50:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54033/worker-3/try#cfeeefe83c83bceb55d60d7e2be173db7597ed50:/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 +cfeeefe83c83bceb55d60d7e2be173db7597ed50-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "1536M" "crater"`
Sep 18 02:19:17.287 INFO blam! d407e4c6b7db8937c6f0ed84c7d18866b2b04dd4e441ba891f13ad54dd38c13e
Sep 18 02:19:17.291 INFO running `"docker" "start" "-a" "d407e4c6b7db8937c6f0ed84c7d18866b2b04dd4e441ba891f13ad54dd38c13e"`
Sep 18 02:19:18.099 INFO kablam! usermod: no changes
Sep 18 02:19:18.182 INFO kablam!     Checking concurrent-hashmap v0.2.2 (/source)
Sep 18 02:19:18.967 INFO kablam! warning: variable does not need to be mutable
Sep 18 02:19:18.967 INFO kablam!    --> src/map.rs:537:13
Sep 18 02:19:18.967 INFO kablam!     |
Sep 18 02:19:18.967 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 18 02:19:18.967 INFO kablam!     |             ----^
Sep 18 02:19:18.967 INFO kablam!     |             |
Sep 18 02:19:18.967 INFO kablam!     |             help: remove this `mut`
Sep 18 02:19:18.967 INFO kablam!     |
Sep 18 02:19:18.967 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 18 02:19:18.967 INFO kablam! 
Sep 18 02:19:19.663 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 18 02:19:19.663 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 18 02:19:19.663 INFO kablam!   |
Sep 18 02:19:19.663 INFO kablam! 1 | #![feature(step_by)]
Sep 18 02:19:19.663 INFO kablam!   |            ^^^^^^^
Sep 18 02:19:19.663 INFO kablam! 
Sep 18 02:19:19.671 INFO kablam! error: aborting due to previous error
Sep 18 02:19:19.671 INFO kablam! 
Sep 18 02:19:19.671 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 18 02:19:19.695 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 18 02:19:19.695 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 18 02:19:20.072 INFO kablam! error: build failed
Sep 18 02:19:20.072 INFO kablam! su: No module specific data is present
Sep 18 02:19:20.814 INFO running `"docker" "rm" "-f" "d407e4c6b7db8937c6f0ed84c7d18866b2b04dd4e441ba891f13ad54dd38c13e"`
Sep 18 02:19:20.875 INFO blam! d407e4c6b7db8937c6f0ed84c7d18866b2b04dd4e441ba891f13ad54dd38c13e