Sep 04 02:30:39.590 INFO checking specs_engine-0.0.3 against master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c for pr-53893
Sep 04 02:30:39.590 INFO running: cargo +28bcffead74d5e17c6cb1f7de432e37f93a6b50c-alt check --frozen --all --all-targets
Sep 04 02:30:39.590 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-53893/master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53893/worker-2/master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c:/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 +28bcffead74d5e17c6cb1f7de432e37f93a6b50c-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 04 02:30:39.769 INFO blam! 8b454fe0c7f5d82243764f153b439f266c5598d2d51d84666f02d8c28c723fcc
Sep 04 02:30:39.772 INFO running `"docker" "start" "-a" "8b454fe0c7f5d82243764f153b439f266c5598d2d51d84666f02d8c28c723fcc"`
Sep 04 02:30:40.641 INFO kablam!     Checking slog v1.7.1
Sep 04 02:30:40.645 INFO kablam!     Checking pulse v0.5.3
Sep 04 02:30:41.515 INFO kablam!     Checking specs v0.7.1
Sep 04 02:30:41.665 INFO kablam!     Checking slog-extra v0.1.2
Sep 04 02:30:42.328 INFO kablam!     Checking slog-stream v1.2.1
Sep 04 02:30:42.967 INFO kablam!     Checking slog-term v1.5.0
Sep 04 02:30:45.988 INFO kablam!     Checking specs_engine v0.0.3 (file:///source)
Sep 04 02:30:47.116 INFO kablam! warning: variable does not need to be mutable
Sep 04 02:30:47.116 INFO kablam!   --> src/machine.rs:39:17
Sep 04 02:30:47.116 INFO kablam!    |
Sep 04 02:30:47.116 INFO kablam! 39 |             let mut state = self._stack.last_mut().expect("Called long update without a state in the stack!");
Sep 04 02:30:47.116 INFO kablam!    |                 ----^^^^^
Sep 04 02:30:47.116 INFO kablam!    |                 |
Sep 04 02:30:47.116 INFO kablam!    |                 help: remove this `mut`
Sep 04 02:30:47.116 INFO kablam!    |
Sep 04 02:30:47.116 INFO kablam!    = note: #[warn(unused_mut)] on by default
Sep 04 02:30:47.116 INFO kablam! 
Sep 04 02:30:47.121 INFO kablam! warning: variable does not need to be mutable
Sep 04 02:30:47.121 INFO kablam!   --> src/machine.rs:73:30
Sep 04 02:30:47.121 INFO kablam!    |
Sep 04 02:30:47.121 INFO kablam! 73 |                  if let Some(mut state) = self._stack.last_mut() {
Sep 04 02:30:47.121 INFO kablam!    |                              ----^^^^^
Sep 04 02:30:47.121 INFO kablam!    |                              |
Sep 04 02:30:47.121 INFO kablam!    |                              help: remove this `mut`
Sep 04 02:30:47.121 INFO kablam! 
Sep 04 02:30:47.486 INFO kablam! warning: variable does not need to be mutable
Sep 04 02:30:47.486 INFO kablam!   --> src/machine.rs:39:17
Sep 04 02:30:47.486 INFO kablam!    |
Sep 04 02:30:47.486 INFO kablam! 39 |             let mut state = self._stack.last_mut().expect("Called long update without a state in the stack!");
Sep 04 02:30:47.486 INFO kablam!    |                 ----^^^^^
Sep 04 02:30:47.486 INFO kablam!    |                 |
Sep 04 02:30:47.486 INFO kablam!    |                 help: remove this `mut`
Sep 04 02:30:47.486 INFO kablam!    |
Sep 04 02:30:47.486 INFO kablam!    = note: #[warn(unused_mut)] on by default
Sep 04 02:30:47.486 INFO kablam! 
Sep 04 02:30:47.491 INFO kablam! warning: variable does not need to be mutable
Sep 04 02:30:47.491 INFO kablam!   --> src/machine.rs:73:30
Sep 04 02:30:47.491 INFO kablam!    |
Sep 04 02:30:47.491 INFO kablam! 73 |                  if let Some(mut state) = self._stack.last_mut() {
Sep 04 02:30:47.491 INFO kablam!    |                              ----^^^^^
Sep 04 02:30:47.491 INFO kablam!    |                              |
Sep 04 02:30:47.491 INFO kablam!    |                              help: remove this `mut`
Sep 04 02:30:47.491 INFO kablam! 
Sep 04 02:30:48.371 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 7.80s
Sep 04 02:30:48.377 INFO kablam! su: No module specific data is present
Sep 04 02:30:48.776 INFO running `"docker" "rm" "-f" "8b454fe0c7f5d82243764f153b439f266c5598d2d51d84666f02d8c28c723fcc"`
Sep 04 02:30:48.897 INFO blam! 8b454fe0c7f5d82243764f153b439f266c5598d2d51d84666f02d8c28c723fcc