Sep 10 10:02:17.720 INFO checking serial-0.4.0 against master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1 for pr-54090
Sep 10 10:02:17.720 INFO running: cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets
Sep 10 10:02:17.720 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-1/pr-54090/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-1/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 10:02:17.861 INFO blam! c51199a0d7142b136b260779ae6e2cf7c98806e9a26727266a5c2f224b77d097
Sep 10 10:02:17.861 INFO running `"docker" "start" "-a" "c51199a0d7142b136b260779ae6e2cf7c98806e9a26727266a5c2f224b77d097"`
Sep 10 10:02:18.703 INFO kablam! usermod: no changes
Sep 10 10:02:18.736 INFO kablam!     Checking serial v0.4.0 (file:///source)
Sep 10 10:02:19.546 INFO kablam! warning: unused import: `std::io::prelude`
Sep 10 10:02:19.546 INFO kablam!  --> examples/read_write.rs:6:5
Sep 10 10:02:19.546 INFO kablam!   |
Sep 10 10:02:19.546 INFO kablam! 6 | use std::io::prelude::*;
Sep 10 10:02:19.546 INFO kablam!   |     ^^^^^^^^^^^^^^^^
Sep 10 10:02:19.546 INFO kablam!   |
Sep 10 10:02:19.546 INFO kablam!   = note: #[warn(unused_imports)] on by default
Sep 10 10:02:19.546 INFO kablam! 
Sep 10 10:02:19.606 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 0.88s
Sep 10 10:02:19.608 INFO kablam! su: No module specific data is present
Sep 10 10:02:20.437 INFO running `"docker" "rm" "-f" "c51199a0d7142b136b260779ae6e2cf7c98806e9a26727266a5c2f224b77d097"`
Sep 10 10:02:20.508 INFO blam! c51199a0d7142b136b260779ae6e2cf7c98806e9a26727266a5c2f224b77d097