Sep 02 00:19:11.481 INFO checking serial-0.4.0 against master#1114ab684fbad001c4e580326d8eb4d8c4e917d3 for pr-53851
Sep 02 00:19:11.481 INFO running: cargo +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets
Sep 02 00:19:11.481 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-53851/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53851/worker-3/master#1114ab684fbad001c4e580326d8eb4d8c4e917d3:/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 +1114ab684fbad001c4e580326d8eb4d8c4e917d3-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 02 00:19:11.714 INFO blam! a94ca9ca6aa174d759e3babfa48a3767ace90496a99b62fbac587c2a32e5f8b2
Sep 02 00:19:11.717 INFO running `"docker" "start" "-a" "a94ca9ca6aa174d759e3babfa48a3767ace90496a99b62fbac587c2a32e5f8b2"`
Sep 02 00:19:12.426 INFO kablam!     Checking serial v0.4.0 (file:///source)
Sep 02 00:19:13.477 INFO kablam! warning: unused import: `std::io::prelude`
Sep 02 00:19:13.477 INFO kablam!  --> examples/read_write.rs:6:5
Sep 02 00:19:13.477 INFO kablam!   |
Sep 02 00:19:13.477 INFO kablam! 6 | use std::io::prelude::*;
Sep 02 00:19:13.477 INFO kablam!   |     ^^^^^^^^^^^^^^^^
Sep 02 00:19:13.478 INFO kablam!   |
Sep 02 00:19:13.478 INFO kablam!   = note: #[warn(unused_imports)] on by default
Sep 02 00:19:13.478 INFO kablam! 
Sep 02 00:19:13.517 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 1.10s
Sep 02 00:19:13.520 INFO kablam! su: No module specific data is present
Sep 02 00:19:13.954 INFO running `"docker" "rm" "-f" "a94ca9ca6aa174d759e3babfa48a3767ace90496a99b62fbac587c2a32e5f8b2"`
Sep 02 00:19:14.073 INFO blam! a94ca9ca6aa174d759e3babfa48a3767ace90496a99b62fbac587c2a32e5f8b2