Sep 04 21:02:14.354 INFO checking config-0.9.0 against master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c for pr-53893
Sep 04 21:02:14.354 INFO running: cargo +28bcffead74d5e17c6cb1f7de432e37f93a6b50c-alt check --frozen --all --all-targets
Sep 04 21:02:14.354 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53893/master#28bcffead74d5e17c6cb1f7de432e37f93a6b50c:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53893/worker-0/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 21:02:14.523 INFO blam! 9290fdddf60b363c41f15b4e755cac580095332f9a35157d5db952f2d9c50973
Sep 04 21:02:14.527 INFO running `"docker" "start" "-a" "9290fdddf60b363c41f15b4e755cac580095332f9a35157d5db952f2d9c50973"`
Sep 04 21:02:15.400 INFO kablam!     Checking config v0.9.0 (file:///source)
Sep 04 21:02:31.324 INFO kablam! warning: variable does not need to be mutable
Sep 04 21:02:31.325 INFO kablam!   --> tests/env.rs:57:9
Sep 04 21:02:31.325 INFO kablam!    |
Sep 04 21:02:31.325 INFO kablam! 57 |     let mut environment = Environment::with_prefix("C").separator("_");
Sep 04 21:02:31.325 INFO kablam!    |         ----^^^^^^^^^^^
Sep 04 21:02:31.325 INFO kablam!    |         |
Sep 04 21:02:31.325 INFO kablam!    |         help: remove this `mut`
Sep 04 21:02:31.325 INFO kablam!    |
Sep 04 21:02:31.325 INFO kablam!    = note: #[warn(unused_mut)] on by default
Sep 04 21:02:31.325 INFO kablam! 
Sep 04 21:02:39.547 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 24.29s
Sep 04 21:02:39.568 INFO kablam! su: No module specific data is present
Sep 04 21:02:39.983 INFO running `"docker" "rm" "-f" "9290fdddf60b363c41f15b4e755cac580095332f9a35157d5db952f2d9c50973"`
Sep 04 21:02:40.082 INFO blam! 9290fdddf60b363c41f15b4e755cac580095332f9a35157d5db952f2d9c50973