Sep 10 21:12:26.606 INFO checking circular-0.2.0 against master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1 for pr-54090
Sep 10 21:12:26.606 INFO running: cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets
Sep 10 21:12:26.606 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-6/pr-54090/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-6/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/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 +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-m" "2G" "crater"`
Sep 10 21:12:26.791 INFO blam! 8936b925391fff5fc075b4736ce68c09168b1bf5153ea6f85d74ba5c1178affc
Sep 10 21:12:26.793 INFO running `"docker" "start" "-a" "8936b925391fff5fc075b4736ce68c09168b1bf5153ea6f85d74ba5c1178affc"`
Sep 10 21:12:27.877 INFO kablam! usermod: no changes
Sep 10 21:12:27.955 INFO kablam!     Checking circular v0.2.0 (file:///source)
Sep 10 21:12:28.617 INFO kablam! warning: unused import: `std::str`
Sep 10 21:12:28.617 INFO kablam!    --> src/lib.rs:387:7
Sep 10 21:12:28.617 INFO kablam!     |
Sep 10 21:12:28.617 INFO kablam! 387 |   use std::str;
Sep 10 21:12:28.617 INFO kablam!     |       ^^^^^^^^
Sep 10 21:12:28.617 INFO kablam!     |
Sep 10 21:12:28.617 INFO kablam!     = note: #[warn(unused_imports)] on by default
Sep 10 21:12:28.617 INFO kablam! 
Sep 10 21:12:29.006 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 1.10s
Sep 10 21:12:29.009 INFO kablam! su: No module specific data is present
Sep 10 21:12:29.901 INFO running `"docker" "rm" "-f" "8936b925391fff5fc075b4736ce68c09168b1bf5153ea6f85d74ba5c1178affc"`
Sep 10 21:12:30.036 INFO blam! 8936b925391fff5fc075b4736ce68c09168b1bf5153ea6f85d74ba5c1178affc