Aug 30 21:03:43.935 INFO checking config-0.9.0 against master#545f22340f72ee0efaf6463efb43a2840e3d35db for pr-53699
Aug 30 21:03:43.935 INFO running: cargo +545f22340f72ee0efaf6463efb43a2840e3d35db-alt check --frozen --all --all-targets
Aug 30 21:03:43.935 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-53699/master#545f22340f72ee0efaf6463efb43a2840e3d35db:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53699/worker-2/master#545f22340f72ee0efaf6463efb43a2840e3d35db:/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 +545f22340f72ee0efaf6463efb43a2840e3d35db-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Aug 30 21:03:44.145 INFO blam! 52c7e94f6a2ff941c90d5b5c4435a92769bc20960e8467823e70901cca8cb234
Aug 30 21:03:44.147 INFO running `"docker" "start" "-a" "52c7e94f6a2ff941c90d5b5c4435a92769bc20960e8467823e70901cca8cb234"`
Aug 30 21:03:44.983 INFO kablam!     Checking config v0.9.0 (file:///source)
Aug 30 21:04:01.323 INFO kablam! warning: variable does not need to be mutable
Aug 30 21:04:01.323 INFO kablam!   --> tests/env.rs:57:9
Aug 30 21:04:01.323 INFO kablam!    |
Aug 30 21:04:01.323 INFO kablam! 57 |     let mut environment = Environment::with_prefix("C").separator("_");
Aug 30 21:04:01.323 INFO kablam!    |         ----^^^^^^^^^^^
Aug 30 21:04:01.323 INFO kablam!    |         |
Aug 30 21:04:01.323 INFO kablam!    |         help: remove this `mut`
Aug 30 21:04:01.323 INFO kablam!    |
Aug 30 21:04:01.323 INFO kablam!    = note: #[warn(unused_mut)] on by default
Aug 30 21:04:01.323 INFO kablam! 
Aug 30 21:04:09.825 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 24.99s
Aug 30 21:04:09.844 INFO kablam! su: No module specific data is present
Aug 30 21:04:10.378 INFO running `"docker" "rm" "-f" "52c7e94f6a2ff941c90d5b5c4435a92769bc20960e8467823e70901cca8cb234"`
Aug 30 21:04:10.518 INFO blam! 52c7e94f6a2ff941c90d5b5c4435a92769bc20960e8467823e70901cca8cb234