Dec 18 08:14:52.314 INFO checking CGQAQ/Rust_Learn against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 08:14:52.314 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/CGQAQ/Rust_Learn:/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 08:14:52.761 INFO [stdout] 8d3409810abde7095ccbd4f7f013659a5a1c418f4c5191550cac5a91799db11a
Dec 18 08:14:52.763 INFO running `"docker" "start" "-a" "8d3409810abde7095ccbd4f7f013659a5a1c418f4c5191550cac5a91799db11a"`
Dec 18 08:14:54.174 INFO [stderr] warning: An explicit [[bin]] section is specified in Cargo.toml which currently
Dec 18 08:14:54.174 INFO [stderr] disables Cargo from automatically inferring other binary targets.
Dec 18 08:14:54.174 INFO [stderr] This inference behavior will change in the Rust 2018 edition and the following
Dec 18 08:14:54.174 INFO [stderr] files will be included as a binary target:
Dec 18 08:14:54.174 INFO [stderr] 
Dec 18 08:14:54.174 INFO [stderr] * /opt/crater/workdir/src/main.rs
Dec 18 08:14:54.174 INFO [stderr] 
Dec 18 08:14:54.174 INFO [stderr] This is likely to break cargo build or cargo test as these files may not be
Dec 18 08:14:54.174 INFO [stderr] ready to be compiled as a binary target today. You can future-proof yourself
Dec 18 08:14:54.174 INFO [stderr] and disable this warning by adding `autobins = false` to your [package]
Dec 18 08:14:54.174 INFO [stderr] section. You may also move the files to a location where Cargo would not
Dec 18 08:14:54.174 INFO [stderr] automatically infer them to be a target, such as in subfolders.
Dec 18 08:14:54.174 INFO [stderr] 
Dec 18 08:14:54.174 INFO [stderr] For more information on this warning you can consult
Dec 18 08:14:54.174 INFO [stderr] https://github.com/rust-lang/cargo/issues/5330
Dec 18 08:14:54.174 INFO [stderr] warning: path `/opt/crater/workdir/src/main.rs` was erroneously implicitly accepted for binary `main`,
Dec 18 08:14:54.174 INFO [stderr] please set bin.path in Cargo.toml
Dec 18 08:14:54.176 INFO [stderr]     Checking learn v0.1.0 (/opt/crater/workdir)
Dec 18 08:14:54.772 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:14:54.772 INFO [stderr]   --> src/bin/mthread.rs:11:9
Dec 18 08:14:54.772 INFO [stderr]    |
Dec 18 08:14:54.772 INFO [stderr] 11 |     let mut ptr = Arc::new(Mutex::new("hello world!".chars()));
Dec 18 08:14:54.772 INFO [stderr]    |         ----^^^
Dec 18 08:14:54.772 INFO [stderr]    |         |
Dec 18 08:14:54.772 INFO [stderr]    |         help: remove this `mut`
Dec 18 08:14:54.772 INFO [stderr]    |
Dec 18 08:14:54.772 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:14:54.772 INFO [stderr] 
Dec 18 08:14:54.772 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:14:54.772 INFO [stderr]   --> src/bin/mthread.rs:27:13
Dec 18 08:14:54.772 INFO [stderr]    |
Dec 18 08:14:54.772 INFO [stderr] 27 |         let mut ptr = ptr.clone();
Dec 18 08:14:54.772 INFO [stderr]    |             ----^^^
Dec 18 08:14:54.772 INFO [stderr]    |             |
Dec 18 08:14:54.772 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:14:54.772 INFO [stderr] 
Dec 18 08:14:54.772 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:14:54.772 INFO [stderr]   --> src/bin/mthread.rs:29:13
Dec 18 08:14:54.772 INFO [stderr]    |
Dec 18 08:14:54.772 INFO [stderr] 29 |         let mut tx = tx.clone();
Dec 18 08:14:54.772 INFO [stderr]    |             ----^^
Dec 18 08:14:54.772 INFO [stderr]    |             |
Dec 18 08:14:54.772 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:14:54.772 INFO [stderr] 
Dec 18 08:14:54.772 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 08:14:54.772 INFO [stderr]   --> src/bin/mthread.rs:20:21
Dec 18 08:14:54.772 INFO [stderr]    |
Dec 18 08:14:54.772 INFO [stderr] 20 |                     a.send(1);
Dec 18 08:14:54.772 INFO [stderr]    |                     ^^^^^^^^^^
Dec 18 08:14:54.772 INFO [stderr]    |
Dec 18 08:14:54.772 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 08:14:54.772 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 08:14:54.772 INFO [stderr] 
Dec 18 08:14:54.772 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 08:14:54.772 INFO [stderr]   --> src/bin/mthread.rs:34:17
Dec 18 08:14:54.772 INFO [stderr]    |
Dec 18 08:14:54.772 INFO [stderr] 34 |                 tx.send(d);
Dec 18 08:14:54.772 INFO [stderr]    |                 ^^^^^^^^^^^
Dec 18 08:14:54.773 INFO [stderr]    |
Dec 18 08:14:54.773 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 08:14:54.773 INFO [stderr] 
Dec 18 08:14:54.957 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:14:54.957 INFO [stderr]   --> src/bin/mthread.rs:11:9
Dec 18 08:14:54.957 INFO [stderr]    |
Dec 18 08:14:54.957 INFO [stderr] 11 |     let mut ptr = Arc::new(Mutex::new("hello world!".chars()));
Dec 18 08:14:54.957 INFO [stderr]    |         ----^^^
Dec 18 08:14:54.957 INFO [stderr]    |         |
Dec 18 08:14:54.957 INFO [stderr]    |         help: remove this `mut`
Dec 18 08:14:54.957 INFO [stderr]    |
Dec 18 08:14:54.957 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:14:54.957 INFO [stderr] 
Dec 18 08:14:54.957 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:14:54.957 INFO [stderr]   --> src/bin/mthread.rs:27:13
Dec 18 08:14:54.957 INFO [stderr]    |
Dec 18 08:14:54.957 INFO [stderr] 27 |         let mut ptr = ptr.clone();
Dec 18 08:14:54.957 INFO [stderr]    |             ----^^^
Dec 18 08:14:54.957 INFO [stderr]    |             |
Dec 18 08:14:54.957 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:14:54.957 INFO [stderr] 
Dec 18 08:14:54.957 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:14:54.957 INFO [stderr]   --> src/bin/mthread.rs:29:13
Dec 18 08:14:54.957 INFO [stderr]    |
Dec 18 08:14:54.957 INFO [stderr] 29 |         let mut tx = tx.clone();
Dec 18 08:14:54.957 INFO [stderr]    |             ----^^
Dec 18 08:14:54.957 INFO [stderr]    |             |
Dec 18 08:14:54.957 INFO [stderr]    |             help: remove this `mut`
Dec 18 08:14:54.957 INFO [stderr] 
Dec 18 08:14:54.957 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 08:14:54.957 INFO [stderr]   --> src/bin/mthread.rs:20:21
Dec 18 08:14:54.957 INFO [stderr]    |
Dec 18 08:14:54.957 INFO [stderr] 20 |                     a.send(1);
Dec 18 08:14:54.957 INFO [stderr]    |                     ^^^^^^^^^^
Dec 18 08:14:54.957 INFO [stderr]    |
Dec 18 08:14:54.957 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 08:14:54.957 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 08:14:54.957 INFO [stderr] 
Dec 18 08:14:54.957 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 08:14:54.957 INFO [stderr]   --> src/bin/mthread.rs:34:17
Dec 18 08:14:54.957 INFO [stderr]    |
Dec 18 08:14:54.957 INFO [stderr] 34 |                 tx.send(d);
Dec 18 08:14:54.957 INFO [stderr]    |                 ^^^^^^^^^^^
Dec 18 08:14:54.957 INFO [stderr]    |
Dec 18 08:14:54.957 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 08:14:54.957 INFO [stderr] 
Dec 18 08:14:55.105 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.96s
Dec 18 08:14:55.782 INFO running `"docker" "inspect" "8d3409810abde7095ccbd4f7f013659a5a1c418f4c5191550cac5a91799db11a"`
Dec 18 08:14:56.078 INFO running `"docker" "rm" "-f" "8d3409810abde7095ccbd4f7f013659a5a1c418f4c5191550cac5a91799db11a"`
Dec 18 08:14:56.227 INFO [stdout] 8d3409810abde7095ccbd4f7f013659a5a1c418f4c5191550cac5a91799db11a