Sep 02 17:42:43.947 INFO checking config-0.9.0 against try#952c7dbfa2628309f557b367929ffc17af20b332 for pr-53851
Sep 02 17:42:43.947 INFO running: cargo +952c7dbfa2628309f557b367929ffc17af20b332-alt check --frozen --all --all-targets
Sep 02 17:42:43.947 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-2/pr-53851/try#952c7dbfa2628309f557b367929ffc17af20b332:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53851/worker-2/try#952c7dbfa2628309f557b367929ffc17af20b332:/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 +952c7dbfa2628309f557b367929ffc17af20b332-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 02 17:42:44.110 INFO blam! 8a65fe3a8764dee404e9f60afd0af41be31542f7abaf853194b19f0b181a559d
Sep 02 17:42:44.112 INFO running `"docker" "start" "-a" "8a65fe3a8764dee404e9f60afd0af41be31542f7abaf853194b19f0b181a559d"`
Sep 02 17:42:44.799 INFO kablam!     Checking config v0.9.0 (file:///source)
Sep 02 17:43:00.972 INFO kablam! warning: variable does not need to be mutable
Sep 02 17:43:00.972 INFO kablam!   --> tests/env.rs:57:9
Sep 02 17:43:00.972 INFO kablam!    |
Sep 02 17:43:00.972 INFO kablam! 57 |     let mut environment = Environment::with_prefix("C").separator("_");
Sep 02 17:43:00.972 INFO kablam!    |         ----^^^^^^^^^^^
Sep 02 17:43:00.972 INFO kablam!    |         |
Sep 02 17:43:00.972 INFO kablam!    |         help: remove this `mut`
Sep 02 17:43:00.972 INFO kablam!    |
Sep 02 17:43:00.972 INFO kablam!    = note: #[warn(unused_mut)] on by default
Sep 02 17:43:00.972 INFO kablam! 
Sep 02 17:43:08.344 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 23.68s
Sep 02 17:43:08.364 INFO kablam! su: No module specific data is present
Sep 02 17:43:08.865 INFO running `"docker" "rm" "-f" "8a65fe3a8764dee404e9f60afd0af41be31542f7abaf853194b19f0b181a559d"`
Sep 02 17:43:08.958 INFO blam! 8a65fe3a8764dee404e9f60afd0af41be31542f7abaf853194b19f0b181a559d