Sep 01 07:38:53.730 INFO checking concurrent-hashmap-0.2.2 against master#d0d81b7fc1421859ba0218e8a437af29ae3b0967 for pr-53578
Sep 01 07:38:53.730 INFO running: cargo +d0d81b7fc1421859ba0218e8a437af29ae3b0967-alt check --frozen --all --all-targets
Sep 01 07:38:53.730 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-53578/master#d0d81b7fc1421859ba0218e8a437af29ae3b0967:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53578/worker-3/master#d0d81b7fc1421859ba0218e8a437af29ae3b0967:/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 +d0d81b7fc1421859ba0218e8a437af29ae3b0967-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 01 07:38:53.922 INFO blam! 7d4af24b716ba1ffcc7729095b32bfbc692004b3bc7efc5d594effcb5b2ec32d
Sep 01 07:38:53.924 INFO running `"docker" "start" "-a" "7d4af24b716ba1ffcc7729095b32bfbc692004b3bc7efc5d594effcb5b2ec32d"`
Sep 01 07:38:54.492 INFO kablam!     Checking spin v0.4.8
Sep 01 07:38:54.745 INFO kablam!     Checking concurrent-hashmap v0.2.2 (file:///source)
Sep 01 07:38:56.673 INFO kablam! warning: variable does not need to be mutable
Sep 01 07:38:56.674 INFO kablam!    --> src/map.rs:537:13
Sep 01 07:38:56.674 INFO kablam!     |
Sep 01 07:38:56.674 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 01 07:38:56.674 INFO kablam!     |             ----^
Sep 01 07:38:56.674 INFO kablam!     |             |
Sep 01 07:38:56.674 INFO kablam!     |             help: remove this `mut`
Sep 01 07:38:56.674 INFO kablam!     |
Sep 01 07:38:56.675 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 01 07:38:56.675 INFO kablam! 
Sep 01 07:38:58.051 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 01 07:38:58.051 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 01 07:38:58.051 INFO kablam!   |
Sep 01 07:38:58.051 INFO kablam! 1 | #![feature(step_by)]
Sep 01 07:38:58.051 INFO kablam!   |            ^^^^^^^
Sep 01 07:38:58.051 INFO kablam! 
Sep 01 07:38:58.056 INFO kablam! error: aborting due to previous error
Sep 01 07:38:58.056 INFO kablam! 
Sep 01 07:38:58.056 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 01 07:38:58.063 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 01 07:38:58.063 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 01 07:38:58.366 INFO kablam! error: build failed
Sep 01 07:38:58.367 INFO kablam! su: No module specific data is present
Sep 01 07:38:58.725 INFO running `"docker" "rm" "-f" "7d4af24b716ba1ffcc7729095b32bfbc692004b3bc7efc5d594effcb5b2ec32d"`
Sep 01 07:38:58.826 INFO blam! 7d4af24b716ba1ffcc7729095b32bfbc692004b3bc7efc5d594effcb5b2ec32d