Sep 06 08:35:41.799 INFO checking concurrent-hashmap-0.2.2 against master#1c2e17f4e3a2070a7f703f51e29c1c388ef703b6 for pr-53854
Sep 06 08:35:41.799 INFO running: cargo +1c2e17f4e3a2070a7f703f51e29c1c388ef703b6-alt check --frozen --all --all-targets
Sep 06 08:35:41.799 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-4/pr-53854/master#1c2e17f4e3a2070a7f703f51e29c1c388ef703b6:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53854/worker-4/master#1c2e17f4e3a2070a7f703f51e29c1c388ef703b6:/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 +1c2e17f4e3a2070a7f703f51e29c1c388ef703b6-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 06 08:35:41.947 INFO blam! 8019bdf574f8b76bec25e5e4c83208a3323729c2e35af996b07023eecbab193b
Sep 06 08:35:41.948 INFO running `"docker" "start" "-a" "8019bdf574f8b76bec25e5e4c83208a3323729c2e35af996b07023eecbab193b"`
Sep 06 08:35:43.026 INFO kablam! usermod: no changes
Sep 06 08:35:43.082 INFO kablam!     Checking spin v0.4.8
Sep 06 08:35:43.422 INFO kablam!     Checking concurrent-hashmap v0.2.2 (file:///source)
Sep 06 08:35:44.074 INFO kablam! warning: variable does not need to be mutable
Sep 06 08:35:44.074 INFO kablam!    --> src/map.rs:537:13
Sep 06 08:35:44.074 INFO kablam!     |
Sep 06 08:35:44.074 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 06 08:35:44.074 INFO kablam!     |             ----^
Sep 06 08:35:44.074 INFO kablam!     |             |
Sep 06 08:35:44.074 INFO kablam!     |             help: remove this `mut`
Sep 06 08:35:44.074 INFO kablam!     |
Sep 06 08:35:44.074 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 06 08:35:44.074 INFO kablam! 
Sep 06 08:35:44.372 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 06 08:35:44.372 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 06 08:35:44.372 INFO kablam!   |
Sep 06 08:35:44.372 INFO kablam! 1 | #![feature(step_by)]
Sep 06 08:35:44.372 INFO kablam!   |            ^^^^^^^
Sep 06 08:35:44.372 INFO kablam! 
Sep 06 08:35:44.376 INFO kablam! error: aborting due to previous error
Sep 06 08:35:44.376 INFO kablam! 
Sep 06 08:35:44.376 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 06 08:35:44.383 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 06 08:35:44.383 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 06 08:35:44.521 INFO kablam! error: build failed
Sep 06 08:35:44.522 INFO kablam! su: No module specific data is present
Sep 06 08:35:45.182 INFO running `"docker" "rm" "-f" "8019bdf574f8b76bec25e5e4c83208a3323729c2e35af996b07023eecbab193b"`
Sep 06 08:35:45.285 INFO blam! 8019bdf574f8b76bec25e5e4c83208a3323729c2e35af996b07023eecbab193b