Aug 11 17:23:02.496 INFO checking concurrent-hashmap-0.2.2 against master#f6d43ed84207c7e58f363f46e5a438ff40f2b311 for libc-1
Aug 11 17:23:02.496 INFO running: cargo +f6d43ed84207c7e58f363f46e5a438ff40f2b311-alt check --frozen --all --all-targets
Aug 11 17:23:02.496 INFO creating container for: cargo +f6d43ed84207c7e58f363f46e5a438ff40f2b311-alt check --frozen --all --all-targets
Aug 11 17:23:02.496 INFO running `"docker" "create" "-v" "/tmp/crater.81uCEtbJifSf:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/libc-1/worker-1/master#f6d43ed84207c7e58f363f46e5a438ff40f2b311:/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" "-v" "/home/ec2-user/crater/./work/local/cargo-home/git:/cargo-home/git:rw,Z" "-e" "USER_ID=500" "-e" "CMD=cargo +f6d43ed84207c7e58f363f46e5a438ff40f2b311-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "crater"`
Aug 11 17:23:02.767 INFO blam! 86008d5771f557b708bb7f64244b73cbca323a003d20513d944a8ebf2698eb82
Aug 11 17:23:02.769 INFO running `"docker" "start" "-a" "86008d5771f557b708bb7f64244b73cbca323a003d20513d944a8ebf2698eb82"`
Aug 11 17:23:04.493 INFO kablam!     Checking spin v0.4.8
Aug 11 17:23:04.814 INFO kablam!     Checking concurrent-hashmap v0.2.2 (file:///source)
Aug 11 17:23:08.004 INFO kablam! error[E0635]: unknown feature `step_by`
Aug 11 17:23:08.004 INFO kablam!  --> examples/wordcount.rs:1:12
Aug 11 17:23:08.004 INFO kablam!   |
Aug 11 17:23:08.004 INFO kablam! 1 | #![feature(step_by)]
Aug 11 17:23:08.004 INFO kablam!   |            ^^^^^^^
Aug 11 17:23:08.005 INFO kablam! 
Aug 11 17:23:08.009 INFO kablam! error: aborting due to previous error
Aug 11 17:23:08.009 INFO kablam! 
Aug 11 17:23:08.010 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Aug 11 17:23:08.018 INFO kablam! error: Could not compile `concurrent-hashmap`.
Aug 11 17:23:08.018 INFO kablam! warning: build failed, waiting for other jobs to finish...
Aug 11 17:23:08.140 INFO kablam! warning: variable does not need to be mutable
Aug 11 17:23:08.140 INFO kablam!    --> src/map.rs:537:13
Aug 11 17:23:08.140 INFO kablam!     |
Aug 11 17:23:08.140 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Aug 11 17:23:08.140 INFO kablam!     |             ----^
Aug 11 17:23:08.140 INFO kablam!     |             |
Aug 11 17:23:08.140 INFO kablam!     |             help: remove this `mut`
Aug 11 17:23:08.140 INFO kablam!     |
Aug 11 17:23:08.141 INFO kablam!     = note: #[warn(unused_mut)] on by default
Aug 11 17:23:08.141 INFO kablam! 
Aug 11 17:23:08.392 INFO kablam! error: build failed
Aug 11 17:23:08.398 INFO kablam! su: No module specific data is present
Aug 11 17:23:08.974 INFO running `"docker" "rm" "-f" "86008d5771f557b708bb7f64244b73cbca323a003d20513d944a8ebf2698eb82"`
Aug 11 17:23:09.126 INFO blam! 86008d5771f557b708bb7f64244b73cbca323a003d20513d944a8ebf2698eb82