Sep 20 03:29:07.584 INFO checking concurrent-hashmap-0.2.2 against master#ff6422d7a392acfc8af28994d65af2bbaecea4f6 for pr-54346
Sep 20 03:29:07.584 INFO running: cargo +ff6422d7a392acfc8af28994d65af2bbaecea4f6-alt check --frozen --all --all-targets
Sep 20 03:29:07.584 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-5/pr-54346/master#ff6422d7a392acfc8af28994d65af2bbaecea4f6:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54346/worker-5/master#ff6422d7a392acfc8af28994d65af2bbaecea4f6:/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 +ff6422d7a392acfc8af28994d65af2bbaecea4f6-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "1536M" "crater"`
Sep 20 03:29:07.784 INFO blam! b7f447ea88bb08b4f93d2f5bb7ca42b56a6d5edc985878bd9a4b56d47e811917
Sep 20 03:29:07.786 INFO running `"docker" "start" "-a" "b7f447ea88bb08b4f93d2f5bb7ca42b56a6d5edc985878bd9a4b56d47e811917"`
Sep 20 03:29:08.909 INFO kablam! usermod: no changes
Sep 20 03:29:08.967 INFO kablam!     Checking concurrent-hashmap v0.2.2 (/source)
Sep 20 03:29:09.613 INFO kablam! warning: variable does not need to be mutable
Sep 20 03:29:09.613 INFO kablam!    --> src/map.rs:537:13
Sep 20 03:29:09.613 INFO kablam!     |
Sep 20 03:29:09.613 INFO kablam! 537 |         let mut e = map.find_mut(&1).unwrap().get();
Sep 20 03:29:09.613 INFO kablam!     |             ----^
Sep 20 03:29:09.613 INFO kablam!     |             |
Sep 20 03:29:09.613 INFO kablam!     |             help: remove this `mut`
Sep 20 03:29:09.613 INFO kablam!     |
Sep 20 03:29:09.613 INFO kablam!     = note: #[warn(unused_mut)] on by default
Sep 20 03:29:09.613 INFO kablam! 
Sep 20 03:29:10.293 INFO kablam! error[E0635]: unknown feature `step_by`
Sep 20 03:29:10.293 INFO kablam!  --> examples/wordcount.rs:1:12
Sep 20 03:29:10.293 INFO kablam!   |
Sep 20 03:29:10.293 INFO kablam! 1 | #![feature(step_by)]
Sep 20 03:29:10.293 INFO kablam!   |            ^^^^^^^
Sep 20 03:29:10.293 INFO kablam! 
Sep 20 03:29:10.293 INFO kablam! error: aborting due to previous error
Sep 20 03:29:10.293 INFO kablam! 
Sep 20 03:29:10.293 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 20 03:29:10.310 INFO kablam! error: Could not compile `concurrent-hashmap`.
Sep 20 03:29:10.310 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 20 03:29:10.568 INFO kablam! error: build failed
Sep 20 03:29:10.570 INFO kablam! su: No module specific data is present
Sep 20 03:29:11.328 INFO running `"docker" "rm" "-f" "b7f447ea88bb08b4f93d2f5bb7ca42b56a6d5edc985878bd9a4b56d47e811917"`
Sep 20 03:29:11.433 INFO blam! b7f447ea88bb08b4f93d2f5bb7ca42b56a6d5edc985878bd9a4b56d47e811917