Dec 19 15:27:00.517 INFO checking jakobdalsgaard/rust-examples against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 15:27:00.517 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-0/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/jakobdalsgaard/rust-examples:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 15:27:00.740 INFO [stdout] 6e205ea6ac8e38f998d20b607e154dc2cb27f8ef4c6488459646da0c9000f1ef
Dec 19 15:27:00.742 INFO running `"docker" "start" "-a" "6e205ea6ac8e38f998d20b607e154dc2cb27f8ef4c6488459646da0c9000f1ef"`
Dec 19 15:27:01.436 INFO [stderr]     Checking log v0.3.6
Dec 19 15:27:01.673 INFO [stderr]     Checking futures v0.1.10
Dec 19 15:27:03.316 INFO [stderr]     Checking rust-examples v0.1.0 (/opt/crater/workdir)
Dec 19 15:27:04.160 INFO [stderr] warning: unused import: `std::thread`
Dec 19 15:27:04.160 INFO [stderr]  --> examples/inc.rs:1:5
Dec 19 15:27:04.161 INFO [stderr]   |
Dec 19 15:27:04.161 INFO [stderr] 1 | use std::thread;
Dec 19 15:27:04.161 INFO [stderr]   |     ^^^^^^^^^^^
Dec 19 15:27:04.162 INFO [stderr]   |
Dec 19 15:27:04.162 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 15:27:04.162 INFO [stderr] 
Dec 19 15:27:04.162 INFO [stderr] warning: unused import: `std::sync::mpsc::channel`
Dec 19 15:27:04.162 INFO [stderr]  --> examples/inc.rs:2:5
Dec 19 15:27:04.162 INFO [stderr]   |
Dec 19 15:27:04.162 INFO [stderr] 2 | use std::sync::mpsc::channel;
Dec 19 15:27:04.162 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 15:27:04.164 INFO [stderr] 
Dec 19 15:27:04.240 INFO [stderr] warning: unused import: `futures::sync::mpsc::Sender`
Dec 19 15:27:04.241 INFO [stderr]  --> examples/futurechannels.rs:7:5
Dec 19 15:27:04.241 INFO [stderr]   |
Dec 19 15:27:04.241 INFO [stderr] 7 | use futures::sync::mpsc::Sender;
Dec 19 15:27:04.241 INFO [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 15:27:04.241 INFO [stderr]   |
Dec 19 15:27:04.241 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 15:27:04.241 INFO [stderr] 
Dec 19 15:27:04.392 INFO [stderr] warning: unused variable: `child2`
Dec 19 15:27:04.392 INFO [stderr]   --> examples/futurechannels.rs:28:7
Dec 19 15:27:04.392 INFO [stderr]    |
Dec 19 15:27:04.392 INFO [stderr] 28 |   let child2 = thread::spawn(move || {
Dec 19 15:27:04.392 INFO [stderr]    |       ^^^^^^ help: consider using `_child2` instead
Dec 19 15:27:04.392 INFO [stderr]    |
Dec 19 15:27:04.392 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 15:27:04.392 INFO [stderr] 
Dec 19 15:27:04.392 INFO [stderr] warning: unused variable: `rest`
Dec 19 15:27:04.392 INFO [stderr]   --> examples/futurechannels.rs:66:14
Dec 19 15:27:04.392 INFO [stderr]    |
Dec 19 15:27:04.392 INFO [stderr] 66 |   let (item, rest) = rest.into_future().wait().ok().unwrap();
Dec 19 15:27:04.392 INFO [stderr]    |              ^^^^ help: consider using `_rest` instead
Dec 19 15:27:04.392 INFO [stderr] 
Dec 19 15:27:04.436 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 15:27:04.436 INFO [stderr]   --> examples/futurechannels.rs:14:5
Dec 19 15:27:04.436 INFO [stderr]    |
Dec 19 15:27:04.437 INFO [stderr] 14 | /     receiver.map(|i| {
Dec 19 15:27:04.437 INFO [stderr] 15 | |       println!("got: {}", i);
Dec 19 15:27:04.437 INFO [stderr] 16 | |     }).wait();
Dec 19 15:27:04.437 INFO [stderr]    | |______________^
Dec 19 15:27:04.437 INFO [stderr]    |
Dec 19 15:27:04.437 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 15:27:04.437 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 15:27:04.440 INFO [stderr] 
Dec 19 15:27:04.440 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 15:27:04.440 INFO [stderr]   --> examples/futurechannels.rs:30:5
Dec 19 15:27:04.440 INFO [stderr]    |
Dec 19 15:27:04.440 INFO [stderr] 30 |     sender2.send(1).and_then(|tx| { println!("sending 2"); tx.send(2) } ).wait();
Dec 19 15:27:04.440 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 15:27:04.440 INFO [stderr]    |
Dec 19 15:27:04.440 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 15:27:04.440 INFO [stderr] 
Dec 19 15:27:04.440 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 15:27:04.440 INFO [stderr]   --> examples/futurechannels.rs:49:3
Dec 19 15:27:04.440 INFO [stderr]    |
Dec 19 15:27:04.440 INFO [stderr] 49 |   sender3.send(5).and_then(|tx| tx.send(6)).wait();
Dec 19 15:27:04.440 INFO [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 15:27:04.440 INFO [stderr]    |
Dec 19 15:27:04.440 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 15:27:04.440 INFO [stderr] 
Dec 19 15:27:04.444 INFO [stderr] warning: variable does not need to be mutable
Dec 19 15:27:04.444 INFO [stderr]  --> examples/stdchannels.rs:8:16
Dec 19 15:27:04.447 INFO [stderr]   |
Dec 19 15:27:04.447 INFO [stderr] 8 |   let (mut tx, mut rx) = sync_channel(0);
Dec 19 15:27:04.447 INFO [stderr]   |                ----^^
Dec 19 15:27:04.447 INFO [stderr]   |                |
Dec 19 15:27:04.447 INFO [stderr]   |                help: remove this `mut`
Dec 19 15:27:04.447 INFO [stderr]   |
Dec 19 15:27:04.447 INFO [stderr]   = note: #[warn(unused_mut)] on by default
Dec 19 15:27:04.447 INFO [stderr] 
Dec 19 15:27:04.447 INFO [stderr] warning: variable does not need to be mutable
Dec 19 15:27:04.447 INFO [stderr]  --> examples/stdchannels.rs:8:8
Dec 19 15:27:04.447 INFO [stderr]   |
Dec 19 15:27:04.447 INFO [stderr] 8 |   let (mut tx, mut rx) = sync_channel(0);
Dec 19 15:27:04.447 INFO [stderr]   |        ----^^
Dec 19 15:27:04.447 INFO [stderr]   |        |
Dec 19 15:27:04.447 INFO [stderr]   |        help: remove this `mut`
Dec 19 15:27:04.447 INFO [stderr] 
Dec 19 15:27:04.492 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 15:27:04.492 INFO [stderr]   --> examples/stdchannels.rs:17:7
Dec 19 15:27:04.492 INFO [stderr]    |
Dec 19 15:27:04.492 INFO [stderr] 17 |       tx.send(7);
Dec 19 15:27:04.492 INFO [stderr]    |       ^^^^^^^^^^^
Dec 19 15:27:04.492 INFO [stderr]    |
Dec 19 15:27:04.492 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 15:27:04.492 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 15:27:04.492 INFO [stderr] 
Dec 19 15:27:04.535 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.11s
Dec 19 15:27:05.318 INFO running `"docker" "inspect" "6e205ea6ac8e38f998d20b607e154dc2cb27f8ef4c6488459646da0c9000f1ef"`
Dec 19 15:27:05.530 INFO running `"docker" "rm" "-f" "6e205ea6ac8e38f998d20b607e154dc2cb27f8ef4c6488459646da0c9000f1ef"`
Dec 19 15:27:05.831 INFO [stdout] 6e205ea6ac8e38f998d20b607e154dc2cb27f8ef4c6488459646da0c9000f1ef