Dec 18 13:10:28.099 INFO checking parallel-0.11.3 against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 13:10:28.099 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-5/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/reg/parallel/0.11.3:/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 13:10:28.524 INFO [stdout] ed9a98cf065340601a3d1344b20f32599eb8f0d7f1b540de6bb25d3a8b4e7f32
Dec 18 13:10:28.532 INFO running `"docker" "start" "-a" "ed9a98cf065340601a3d1344b20f32599eb8f0d7f1b540de6bb25d3a8b4e7f32"`
Dec 18 13:10:29.784 INFO [stderr]     Checking permutate v0.3.2
Dec 18 13:10:29.784 INFO [stderr]     Checking numtoa v0.0.7
Dec 18 13:10:29.784 INFO [stderr]    Compiling sys-info v0.4.1
Dec 18 13:10:30.921 INFO [stderr]     Checking parallel v0.11.3 (/opt/crater/workdir)
Dec 18 13:10:31.276 INFO [stderr] warning: doc comment not used by rustdoc
Dec 18 13:10:31.276 INFO [stderr]    --> src/main.rs:242:9
Dec 18 13:10:31.276 INFO [stderr]     |
Dec 18 13:10:31.276 INFO [stderr] 242 |         /// Prints messages from executed commands in the correct order.
Dec 18 13:10:31.276 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 13:10:31.276 INFO [stderr]     |
Dec 18 13:10:31.276 INFO [stderr]     = note: #[warn(unused_doc_comments)] on by default
Dec 18 13:10:31.276 INFO [stderr] 
Dec 18 13:10:31.276 INFO [stderr] warning: doc comment not used by rustdoc
Dec 18 13:10:31.276 INFO [stderr]    --> src/main.rs:245:9
Dec 18 13:10:31.276 INFO [stderr]     |
Dec 18 13:10:31.276 INFO [stderr] 245 |         /// Wait for all threads to exit before proceeding.
Dec 18 13:10:31.276 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 13:10:31.276 INFO [stderr] 
Dec 18 13:10:31.288 INFO [stderr] warning: unnecessary parentheses around method argument
Dec 18 13:10:31.288 INFO [stderr]    --> src/input_iterator/iterator.rs:231:48
Dec 18 13:10:31.288 INFO [stderr]     |
Dec 18 13:10:31.288 INFO [stderr] 231 |         for (actual, expected) in iterator.zip((1..4096)) {
Dec 18 13:10:31.288 INFO [stderr]     |                                                ^^^^^^^^^ help: remove these parentheses
Dec 18 13:10:31.288 INFO [stderr]     |
Dec 18 13:10:31.288 INFO [stderr]     = note: #[warn(unused_parens)] on by default
Dec 18 13:10:31.288 INFO [stderr] 
Dec 18 13:10:31.288 INFO [stderr] warning: doc comment not used by rustdoc
Dec 18 13:10:31.288 INFO [stderr]    --> src/main.rs:242:9
Dec 18 13:10:31.288 INFO [stderr]     |
Dec 18 13:10:31.288 INFO [stderr] 242 |         /// Prints messages from executed commands in the correct order.
Dec 18 13:10:31.288 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 13:10:31.288 INFO [stderr]     |
Dec 18 13:10:31.288 INFO [stderr]     = note: #[warn(unused_doc_comments)] on by default
Dec 18 13:10:31.288 INFO [stderr] 
Dec 18 13:10:31.288 INFO [stderr] warning: doc comment not used by rustdoc
Dec 18 13:10:31.288 INFO [stderr]    --> src/main.rs:245:9
Dec 18 13:10:31.288 INFO [stderr]     |
Dec 18 13:10:31.288 INFO [stderr] 245 |         /// Wait for all threads to exit before proceeding.
Dec 18 13:10:31.288 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 13:10:31.288 INFO [stderr] 
Dec 18 13:10:31.972 INFO [stderr] warning: variable does not need to be mutable
Dec 18 13:10:31.972 INFO [stderr]    --> src/arguments/mod.rs:553:9
Dec 18 13:10:31.972 INFO [stderr]     |
Dec 18 13:10:31.972 INFO [stderr] 553 |     let mut append_list = &mut Vec::new();
Dec 18 13:10:31.972 INFO [stderr]     |         ----^^^^^^^^^^^
Dec 18 13:10:31.972 INFO [stderr]     |         |
Dec 18 13:10:31.972 INFO [stderr]     |         help: remove this `mut`
Dec 18 13:10:31.972 INFO [stderr]     |
Dec 18 13:10:31.972 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 18 13:10:31.972 INFO [stderr] 
Dec 18 13:10:32.032 INFO [stderr] warning: variable does not need to be mutable
Dec 18 13:10:32.032 INFO [stderr]   --> src/execute/exec_commands.rs:36:13
Dec 18 13:10:32.032 INFO [stderr]    |
Dec 18 13:10:32.032 INFO [stderr] 36 |         let mut command_buffer = &mut String::with_capacity(64);
Dec 18 13:10:32.032 INFO [stderr]    |             ----^^^^^^^^^^^^^^
Dec 18 13:10:32.032 INFO [stderr]    |             |
Dec 18 13:10:32.032 INFO [stderr]    |             help: remove this `mut`
Dec 18 13:10:32.032 INFO [stderr] 
Dec 18 13:10:32.092 INFO [stderr] warning: variable does not need to be mutable
Dec 18 13:10:32.093 INFO [stderr]   --> src/execute/pipe.rs:41:17
Dec 18 13:10:32.093 INFO [stderr]    |
Dec 18 13:10:32.093 INFO [stderr] 41 |             let mut stdout = child.stdout.as_mut().expect("unable to open stdout of child");
Dec 18 13:10:32.093 INFO [stderr]    |                 ----^^^^^^
Dec 18 13:10:32.093 INFO [stderr]    |                 |
Dec 18 13:10:32.093 INFO [stderr]    |                 help: remove this `mut`
Dec 18 13:10:32.093 INFO [stderr] 
Dec 18 13:10:32.093 INFO [stderr] warning: variable does not need to be mutable
Dec 18 13:10:32.093 INFO [stderr]    --> src/arguments/mod.rs:553:9
Dec 18 13:10:32.093 INFO [stderr]     |
Dec 18 13:10:32.093 INFO [stderr] 553 |     let mut append_list = &mut Vec::new();
Dec 18 13:10:32.093 INFO [stderr]     |         ----^^^^^^^^^^^
Dec 18 13:10:32.093 INFO [stderr]     |         |
Dec 18 13:10:32.093 INFO [stderr]     |         help: remove this `mut`
Dec 18 13:10:32.093 INFO [stderr]     |
Dec 18 13:10:32.093 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 18 13:10:32.093 INFO [stderr] 
Dec 18 13:10:32.176 INFO [stderr] warning: variable does not need to be mutable
Dec 18 13:10:32.176 INFO [stderr]   --> src/execute/exec_commands.rs:36:13
Dec 18 13:10:32.176 INFO [stderr]    |
Dec 18 13:10:32.176 INFO [stderr] 36 |         let mut command_buffer = &mut String::with_capacity(64);
Dec 18 13:10:32.176 INFO [stderr]    |             ----^^^^^^^^^^^^^^
Dec 18 13:10:32.176 INFO [stderr]    |             |
Dec 18 13:10:32.176 INFO [stderr]    |             help: remove this `mut`
Dec 18 13:10:32.176 INFO [stderr] 
Dec 18 13:10:32.248 INFO [stderr] warning: variable does not need to be mutable
Dec 18 13:10:32.248 INFO [stderr]   --> src/execute/pipe.rs:41:17
Dec 18 13:10:32.248 INFO [stderr]    |
Dec 18 13:10:32.248 INFO [stderr] 41 |             let mut stdout = child.stdout.as_mut().expect("unable to open stdout of child");
Dec 18 13:10:32.248 INFO [stderr]    |                 ----^^^^^^
Dec 18 13:10:32.248 INFO [stderr]    |                 |
Dec 18 13:10:32.248 INFO [stderr]    |                 help: remove this `mut`
Dec 18 13:10:32.248 INFO [stderr] 
Dec 18 13:10:32.396 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.65s
Dec 18 13:10:32.896 INFO running `"docker" "inspect" "ed9a98cf065340601a3d1344b20f32599eb8f0d7f1b540de6bb25d3a8b4e7f32"`
Dec 18 13:10:32.990 INFO running `"docker" "rm" "-f" "ed9a98cf065340601a3d1344b20f32599eb8f0d7f1b540de6bb25d3a8b4e7f32"`
Dec 18 13:10:33.184 INFO [stdout] ed9a98cf065340601a3d1344b20f32599eb8f0d7f1b540de6bb25d3a8b4e7f32