Dec 05 03:11:36.266 INFO checking CGQAQ/Rust_Learn against master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc for pr-56481
Dec 05 03:11:36.266 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-1/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56481/master#c8ae2de8363be088604ffa2ccba84ff7ad7250bc:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +c8ae2de8363be088604ffa2ccba84ff7ad7250bc-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 05 03:11:36.712 INFO [stdout] 5bdc9ec3da11cfecb9bb0a62ad51d3f21761f28f5d44e198f417fdfc41b5d768
Dec 05 03:11:36.714 INFO running `"docker" "start" "-a" "5bdc9ec3da11cfecb9bb0a62ad51d3f21761f28f5d44e198f417fdfc41b5d768"`
Dec 05 03:11:39.378 INFO [stderr] usermod: no changes
Dec 05 03:11:39.437 INFO [stderr] warning: An explicit [[bin]] section is specified in Cargo.toml which currently
Dec 05 03:11:39.437 INFO [stderr] disables Cargo from automatically inferring other binary targets.
Dec 05 03:11:39.437 INFO [stderr] This inference behavior will change in the Rust 2018 edition and the following
Dec 05 03:11:39.437 INFO [stderr] files will be included as a binary target:
Dec 05 03:11:39.437 INFO [stderr] 
Dec 05 03:11:39.437 INFO [stderr] * /source/src/main.rs
Dec 05 03:11:39.437 INFO [stderr] 
Dec 05 03:11:39.437 INFO [stderr] This is likely to break cargo build or cargo test as these files may not be
Dec 05 03:11:39.437 INFO [stderr] ready to be compiled as a binary target today. You can future-proof yourself
Dec 05 03:11:39.437 INFO [stderr] and disable this warning by adding `autobins = false` to your [package]
Dec 05 03:11:39.437 INFO [stderr] section. You may also move the files to a location where Cargo would not
Dec 05 03:11:39.437 INFO [stderr] automatically infer them to be a target, such as in subfolders.
Dec 05 03:11:39.437 INFO [stderr] 
Dec 05 03:11:39.437 INFO [stderr] For more information on this warning you can consult
Dec 05 03:11:39.437 INFO [stderr] https://github.com/rust-lang/cargo/issues/5330
Dec 05 03:11:39.437 INFO [stderr] warning: path `/source/src/main.rs` was erroneously implicitly accepted for binary `main`,
Dec 05 03:11:39.437 INFO [stderr] please set bin.path in Cargo.toml
Dec 05 03:11:39.451 INFO [stderr]     Checking learn v0.1.0 (/source)
Dec 05 03:11:41.803 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:11:41.803 INFO [stderr]   --> src/bin/mthread.rs:11:9
Dec 05 03:11:41.804 INFO [stderr]    |
Dec 05 03:11:41.804 INFO [stderr] 11 |     let mut ptr = Arc::new(Mutex::new("hello world!".chars()));
Dec 05 03:11:41.804 INFO [stderr]    |         ----^^^
Dec 05 03:11:41.804 INFO [stderr]    |         |
Dec 05 03:11:41.804 INFO [stderr]    |         help: remove this `mut`
Dec 05 03:11:41.805 INFO [stderr]    |
Dec 05 03:11:41.805 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 03:11:41.805 INFO [stderr] 
Dec 05 03:11:41.805 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:11:41.805 INFO [stderr]   --> src/bin/mthread.rs:27:13
Dec 05 03:11:41.805 INFO [stderr]    |
Dec 05 03:11:41.805 INFO [stderr] 27 |         let mut ptr = ptr.clone();
Dec 05 03:11:41.805 INFO [stderr]    |             ----^^^
Dec 05 03:11:41.805 INFO [stderr]    |             |
Dec 05 03:11:41.805 INFO [stderr]    |             help: remove this `mut`
Dec 05 03:11:41.806 INFO [stderr] 
Dec 05 03:11:41.807 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:11:41.807 INFO [stderr]   --> src/bin/mthread.rs:29:13
Dec 05 03:11:41.807 INFO [stderr]    |
Dec 05 03:11:41.807 INFO [stderr] 29 |         let mut tx = tx.clone();
Dec 05 03:11:41.807 INFO [stderr]    |             ----^^
Dec 05 03:11:41.807 INFO [stderr]    |             |
Dec 05 03:11:41.807 INFO [stderr]    |             help: remove this `mut`
Dec 05 03:11:41.807 INFO [stderr] 
Dec 05 03:11:41.807 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 03:11:41.807 INFO [stderr]   --> src/bin/mthread.rs:20:21
Dec 05 03:11:41.808 INFO [stderr]    |
Dec 05 03:11:41.808 INFO [stderr] 20 |                     a.send(1);
Dec 05 03:11:41.808 INFO [stderr]    |                     ^^^^^^^^^^
Dec 05 03:11:41.808 INFO [stderr]    |
Dec 05 03:11:41.808 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 03:11:41.808 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 03:11:41.809 INFO [stderr] 
Dec 05 03:11:41.809 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 03:11:41.809 INFO [stderr]   --> src/bin/mthread.rs:34:17
Dec 05 03:11:41.809 INFO [stderr]    |
Dec 05 03:11:41.809 INFO [stderr] 34 |                 tx.send(d);
Dec 05 03:11:41.809 INFO [stderr]    |                 ^^^^^^^^^^^
Dec 05 03:11:41.810 INFO [stderr]    |
Dec 05 03:11:41.810 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 03:11:41.810 INFO [stderr] 
Dec 05 03:11:42.139 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:11:42.139 INFO [stderr]   --> src/bin/mthread.rs:11:9
Dec 05 03:11:42.139 INFO [stderr]    |
Dec 05 03:11:42.139 INFO [stderr] 11 |     let mut ptr = Arc::new(Mutex::new("hello world!".chars()));
Dec 05 03:11:42.139 INFO [stderr]    |         ----^^^
Dec 05 03:11:42.139 INFO [stderr]    |         |
Dec 05 03:11:42.139 INFO [stderr]    |         help: remove this `mut`
Dec 05 03:11:42.139 INFO [stderr]    |
Dec 05 03:11:42.139 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 03:11:42.139 INFO [stderr] 
Dec 05 03:11:42.139 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:11:42.139 INFO [stderr]   --> src/bin/mthread.rs:27:13
Dec 05 03:11:42.139 INFO [stderr]    |
Dec 05 03:11:42.139 INFO [stderr] 27 |         let mut ptr = ptr.clone();
Dec 05 03:11:42.139 INFO [stderr]    |             ----^^^
Dec 05 03:11:42.139 INFO [stderr]    |             |
Dec 05 03:11:42.139 INFO [stderr]    |             help: remove this `mut`
Dec 05 03:11:42.139 INFO [stderr] 
Dec 05 03:11:42.139 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:11:42.139 INFO [stderr]   --> src/bin/mthread.rs:29:13
Dec 05 03:11:42.139 INFO [stderr]    |
Dec 05 03:11:42.139 INFO [stderr] 29 |         let mut tx = tx.clone();
Dec 05 03:11:42.139 INFO [stderr]    |             ----^^
Dec 05 03:11:42.139 INFO [stderr]    |             |
Dec 05 03:11:42.139 INFO [stderr]    |             help: remove this `mut`
Dec 05 03:11:42.139 INFO [stderr] 
Dec 05 03:11:42.139 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 03:11:42.139 INFO [stderr]   --> src/bin/mthread.rs:20:21
Dec 05 03:11:42.139 INFO [stderr]    |
Dec 05 03:11:42.139 INFO [stderr] 20 |                     a.send(1);
Dec 05 03:11:42.139 INFO [stderr]    |                     ^^^^^^^^^^
Dec 05 03:11:42.139 INFO [stderr]    |
Dec 05 03:11:42.139 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 03:11:42.139 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 03:11:42.139 INFO [stderr] 
Dec 05 03:11:42.139 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 03:11:42.139 INFO [stderr]   --> src/bin/mthread.rs:34:17
Dec 05 03:11:42.139 INFO [stderr]    |
Dec 05 03:11:42.139 INFO [stderr] 34 |                 tx.send(d);
Dec 05 03:11:42.139 INFO [stderr]    |                 ^^^^^^^^^^^
Dec 05 03:11:42.139 INFO [stderr]    |
Dec 05 03:11:42.139 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 03:11:42.139 INFO [stderr] 
Dec 05 03:11:42.186 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.77s
Dec 05 03:11:42.195 INFO [stderr] su: No module specific data is present
Dec 05 03:11:42.947 INFO running `"docker" "inspect" "5bdc9ec3da11cfecb9bb0a62ad51d3f21761f28f5d44e198f417fdfc41b5d768"`
Dec 05 03:11:43.351 INFO running `"docker" "rm" "-f" "5bdc9ec3da11cfecb9bb0a62ad51d3f21761f28f5d44e198f417fdfc41b5d768"`
Dec 05 03:11:43.747 INFO [stdout] 5bdc9ec3da11cfecb9bb0a62ad51d3f21761f28f5d44e198f417fdfc41b5d768