Dec 18 03:01:56.663 INFO checking brandonpollack23/rust_wc against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 03:01:56.664 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/brandonpollack23/rust_wc:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 03:01:57.188 INFO [stdout] 5035d5fac014142520d058d37e82b3bf585e371c1ebd151982ca677de9fdf970
Dec 18 03:01:57.199 INFO running `"docker" "start" "-a" "5035d5fac014142520d058d37e82b3bf585e371c1ebd151982ca677de9fdf970"`
Dec 18 03:01:59.116 INFO [stderr]     Checking rust_wc v0.1.0 (/opt/crater/workdir)
Dec 18 03:01:59.712 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.712 INFO [stderr]   --> src/word_count.rs:35:13
Dec 18 03:01:59.712 INFO [stderr]    |
Dec 18 03:01:59.712 INFO [stderr] 35 |             write!(&mut output, "{} ", self.lines);
Dec 18 03:01:59.712 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.712 INFO [stderr]    |
Dec 18 03:01:59.712 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 03:01:59.712 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.712 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.712 INFO [stderr] 
Dec 18 03:01:59.712 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.712 INFO [stderr]   --> src/word_count.rs:38:13
Dec 18 03:01:59.712 INFO [stderr]    |
Dec 18 03:01:59.712 INFO [stderr] 38 |             write!(&mut output, "{} ", self.words);
Dec 18 03:01:59.712 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.716 INFO [stderr]    |
Dec 18 03:01:59.716 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.716 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.716 INFO [stderr] 
Dec 18 03:01:59.716 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.716 INFO [stderr]   --> src/word_count.rs:41:13
Dec 18 03:01:59.716 INFO [stderr]    |
Dec 18 03:01:59.716 INFO [stderr] 41 |             write!(&mut output, "{} ", self.bytes);
Dec 18 03:01:59.716 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.716 INFO [stderr]    |
Dec 18 03:01:59.716 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.716 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.716 INFO [stderr] 
Dec 18 03:01:59.716 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.716 INFO [stderr]   --> src/word_count.rs:44:13
Dec 18 03:01:59.716 INFO [stderr]    |
Dec 18 03:01:59.716 INFO [stderr] 44 |             write!(&mut output, "{} ", self.chars);
Dec 18 03:01:59.716 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.716 INFO [stderr]    |
Dec 18 03:01:59.716 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.717 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.717 INFO [stderr] 
Dec 18 03:01:59.717 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.717 INFO [stderr]   --> src/word_count.rs:47:13
Dec 18 03:01:59.717 INFO [stderr]    |
Dec 18 03:01:59.717 INFO [stderr] 47 |             write!(&mut output, "{} ", self.max_length);
Dec 18 03:01:59.717 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.717 INFO [stderr]    |
Dec 18 03:01:59.717 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.717 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.717 INFO [stderr] 
Dec 18 03:01:59.840 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.840 INFO [stderr]   --> src/word_count.rs:35:13
Dec 18 03:01:59.840 INFO [stderr]    |
Dec 18 03:01:59.840 INFO [stderr] 35 |             write!(&mut output, "{} ", self.lines);
Dec 18 03:01:59.840 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.840 INFO [stderr]    |
Dec 18 03:01:59.840 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 03:01:59.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.841 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.841 INFO [stderr] 
Dec 18 03:01:59.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.841 INFO [stderr]   --> src/word_count.rs:38:13
Dec 18 03:01:59.841 INFO [stderr]    |
Dec 18 03:01:59.841 INFO [stderr] 38 |             write!(&mut output, "{} ", self.words);
Dec 18 03:01:59.841 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.841 INFO [stderr]    |
Dec 18 03:01:59.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.841 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.841 INFO [stderr] 
Dec 18 03:01:59.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.841 INFO [stderr]   --> src/word_count.rs:41:13
Dec 18 03:01:59.841 INFO [stderr]    |
Dec 18 03:01:59.841 INFO [stderr] 41 |             write!(&mut output, "{} ", self.bytes);
Dec 18 03:01:59.841 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.841 INFO [stderr]    |
Dec 18 03:01:59.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.841 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.841 INFO [stderr] 
Dec 18 03:01:59.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.841 INFO [stderr]   --> src/word_count.rs:44:13
Dec 18 03:01:59.841 INFO [stderr]    |
Dec 18 03:01:59.841 INFO [stderr] 44 |             write!(&mut output, "{} ", self.chars);
Dec 18 03:01:59.841 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.841 INFO [stderr]    |
Dec 18 03:01:59.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.841 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.841 INFO [stderr] 
Dec 18 03:01:59.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 03:01:59.841 INFO [stderr]   --> src/word_count.rs:47:13
Dec 18 03:01:59.841 INFO [stderr]    |
Dec 18 03:01:59.841 INFO [stderr] 47 |             write!(&mut output, "{} ", self.max_length);
Dec 18 03:01:59.841 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 03:01:59.841 INFO [stderr]    |
Dec 18 03:01:59.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 03:01:59.841 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 18 03:01:59.841 INFO [stderr] 
Dec 18 03:01:59.881 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.85s
Dec 18 03:02:00.621 INFO running `"docker" "inspect" "5035d5fac014142520d058d37e82b3bf585e371c1ebd151982ca677de9fdf970"`
Dec 18 03:02:00.882 INFO running `"docker" "rm" "-f" "5035d5fac014142520d058d37e82b3bf585e371c1ebd151982ca677de9fdf970"`
Dec 18 03:02:01.168 INFO [stdout] 5035d5fac014142520d058d37e82b3bf585e371c1ebd151982ca677de9fdf970