Sep 14 18:15:21.594 INFO checking concurrent-hashmap-0.2.2 against try#87b8e7411c4f1267d0cac0d63fa9c21c943e2ea0 for pr-53578-1
Sep 14 18:15:21.594 INFO running: cargo +87b8e7411c4f1267d0cac0d63fa9c21c943e2ea0-alt check --frozen --all --all-targets
Sep 14 18:15:21.594 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53578-1/try#87b8e7411c4f1267d0cac0d63fa9c21c943e2ea0:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53578-1/worker-0/try#87b8e7411c4f1267d0cac0d63fa9c21c943e2ea0:/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 +87b8e7411c4f1267d0cac0d63fa9c21c943e2ea0-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 14 18:15:21.733 INFO blam! 8b26666e96bf578a39a412b2249b2a9c941c97b91d048ddc54525e12be9f2563
Sep 14 18:15:21.734 INFO running `"docker" "start" "-a" "8b26666e96bf578a39a412b2249b2a9c941c97b91d048ddc54525e12be9f2563"`
Sep 14 18:15:23.528 INFO kablam! usermod: no changes
Sep 14 18:15:23.565 INFO kablam!     Checking spin v0.4.8
Sep 14 18:15:23.702 INFO kablam!     Checking concurrent-hashmap v0.2.2 (file:///source)
Sep 14 18:15:24.244 INFO kablam! warning: variable does not need to be mutable
Sep 14 18:15:24.244 INFO kablam!    --> src/map.rs:537:13
Sep 14 18:15:24.244 INFO kablam!     |
Sep 14 18:15:24.244 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 14 18:15:24.244 INFO kablam!     |             ----^
Sep 14 18:15:24.244 INFO kablam!     |             |
Sep 14 18:15:24.244 INFO kablam!     |             help: remove this `mut`
Sep 14 18:15:24.244 INFO kablam!     |
Sep 14 18:15:24.244 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 14 18:15:24.244 INFO kablam! 
Sep 14 18:15:24.599 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 14 18:15:24.599 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 14 18:15:24.599 INFO kablam!   |
Sep 14 18:15:24.599 INFO kablam! 1 | #![feature(step_by)]
Sep 14 18:15:24.599 INFO kablam!   |            ^^^^^^^
Sep 14 18:15:24.599 INFO kablam! 
Sep 14 18:15:24.599 INFO kablam! error: aborting due to previous error
Sep 14 18:15:24.599 INFO kablam! 
Sep 14 18:15:24.599 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 14 18:15:24.630 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 14 18:15:24.631 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 14 18:15:24.725 INFO kablam! error: build failed
Sep 14 18:15:24.726 INFO kablam! su: No module specific data is present
Sep 14 18:15:25.385 INFO running `"docker" "rm" "-f" "8b26666e96bf578a39a412b2249b2a9c941c97b91d048ddc54525e12be9f2563"`
Sep 14 18:15:25.470 INFO blam! 8b26666e96bf578a39a412b2249b2a9c941c97b91d048ddc54525e12be9f2563