Dec 19 06:45:33.875 INFO checking tperdue321/rust_ownership against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 06:45:33.875 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/tperdue321/rust_ownership:/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 06:45:34.178 INFO [stdout] 2f187ab228afa002224d3202b622b03a5d4ffb23e8216af388af189f6c66f665
Dec 19 06:45:34.182 INFO running `"docker" "start" "-a" "2f187ab228afa002224d3202b622b03a5d4ffb23e8216af388af189f6c66f665"`
Dec 19 06:45:35.620 INFO [stderr]     Checking ownership v0.1.0 (/opt/crater/workdir)
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `string`
Dec 19 06:45:35.777 INFO [stderr]   --> src/main.rs:13:13
Dec 19 06:45:35.777 INFO [stderr]    |
Dec 19 06:45:35.777 INFO [stderr] 13 |         let string = "hello"; // string is valid from here forward
Dec 19 06:45:35.777 INFO [stderr]    |             ^^^^^^ help: consider using `_string` instead
Dec 19 06:45:35.777 INFO [stderr]    |
Dec 19 06:45:35.777 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `s2`
Dec 19 06:45:35.777 INFO [stderr]   --> src/main.rs:40:9
Dec 19 06:45:35.777 INFO [stderr]    |
Dec 19 06:45:35.777 INFO [stderr] 40 |     let s2 = s1;
Dec 19 06:45:35.777 INFO [stderr]    |         ^^ help: consider using `_s2` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `s1`
Dec 19 06:45:35.777 INFO [stderr]   --> src/main.rs:68:9
Dec 19 06:45:35.777 INFO [stderr]    |
Dec 19 06:45:35.777 INFO [stderr] 68 |     let s1 = gives_ownership();         // gives_ownership moves its return
Dec 19 06:45:35.777 INFO [stderr]    |         ^^ help: consider using `_s1` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `r1`
Dec 19 06:45:35.777 INFO [stderr]   --> src/main.rs:98:9
Dec 19 06:45:35.777 INFO [stderr]    |
Dec 19 06:45:35.777 INFO [stderr] 98 |     let r1 = &mut s2;
Dec 19 06:45:35.777 INFO [stderr]    |         ^^ help: consider using `_r1` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `r3`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:107:13
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 107 |         let r3 = &mut s3;
Dec 19 06:45:35.777 INFO [stderr]     |             ^^ help: consider using `_r3` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `r4`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:110:9
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 110 |     let r4 = &mut s3;
Dec 19 06:45:35.777 INFO [stderr]     |         ^^ help: consider using `_r4` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `r1`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:113:9
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 113 |     let r1 = &s; // immutable ref
Dec 19 06:45:35.777 INFO [stderr]     |         ^^ help: consider using `_r1` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `r2`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:114:9
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 114 |     let r2 = &s; // second because as many refs can read the same data safely
Dec 19 06:45:35.777 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:140:9
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 140 |     let slice = &s[0..2];   // same
Dec 19 06:45:35.777 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:141:9
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 141 |     let slice = &s[..2];    // same
Dec 19 06:45:35.777 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:145:9
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 145 |     let slice = &s[2..len]; // same
Dec 19 06:45:35.777 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:146:9
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 146 |     let slice = &s[2..];    // same
Dec 19 06:45:35.777 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.777 INFO [stderr] 
Dec 19 06:45:35.777 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.777 INFO [stderr]    --> src/main.rs:148:9
Dec 19 06:45:35.777 INFO [stderr]     |
Dec 19 06:45:35.777 INFO [stderr] 148 |     let slice = &s[0..len]; // same
Dec 19 06:45:35.778 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.778 INFO [stderr] 
Dec 19 06:45:35.778 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.778 INFO [stderr]    --> src/main.rs:149:9
Dec 19 06:45:35.778 INFO [stderr]     |
Dec 19 06:45:35.778 INFO [stderr] 149 |     let slice = &s[..];     // same
Dec 19 06:45:35.778 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.778 INFO [stderr] 
Dec 19 06:45:35.778 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.778 INFO [stderr]    --> src/main.rs:166:9
Dec 19 06:45:35.778 INFO [stderr]     |
Dec 19 06:45:35.778 INFO [stderr] 166 |     let slice = &a[0..2];
Dec 19 06:45:35.778 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.778 INFO [stderr] 
Dec 19 06:45:35.792 INFO [stderr] warning: variable does not need to be mutable
Dec 19 06:45:35.792 INFO [stderr]    --> src/main.rs:112:9
Dec 19 06:45:35.792 INFO [stderr]     |
Dec 19 06:45:35.792 INFO [stderr] 112 |     let mut s = String::from("hello s");
Dec 19 06:45:35.792 INFO [stderr]     |         ----^
Dec 19 06:45:35.792 INFO [stderr]     |         |
Dec 19 06:45:35.792 INFO [stderr]     |         help: remove this `mut`
Dec 19 06:45:35.792 INFO [stderr]     |
Dec 19 06:45:35.792 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 19 06:45:35.792 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `string`
Dec 19 06:45:35.805 INFO [stderr]   --> src/main.rs:13:13
Dec 19 06:45:35.805 INFO [stderr]    |
Dec 19 06:45:35.805 INFO [stderr] 13 |         let string = "hello"; // string is valid from here forward
Dec 19 06:45:35.805 INFO [stderr]    |             ^^^^^^ help: consider using `_string` instead
Dec 19 06:45:35.805 INFO [stderr]    |
Dec 19 06:45:35.805 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `s2`
Dec 19 06:45:35.805 INFO [stderr]   --> src/main.rs:40:9
Dec 19 06:45:35.805 INFO [stderr]    |
Dec 19 06:45:35.805 INFO [stderr] 40 |     let s2 = s1;
Dec 19 06:45:35.805 INFO [stderr]    |         ^^ help: consider using `_s2` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `s1`
Dec 19 06:45:35.805 INFO [stderr]   --> src/main.rs:68:9
Dec 19 06:45:35.805 INFO [stderr]    |
Dec 19 06:45:35.805 INFO [stderr] 68 |     let s1 = gives_ownership();         // gives_ownership moves its return
Dec 19 06:45:35.805 INFO [stderr]    |         ^^ help: consider using `_s1` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `r1`
Dec 19 06:45:35.805 INFO [stderr]   --> src/main.rs:98:9
Dec 19 06:45:35.805 INFO [stderr]    |
Dec 19 06:45:35.805 INFO [stderr] 98 |     let r1 = &mut s2;
Dec 19 06:45:35.805 INFO [stderr]    |         ^^ help: consider using `_r1` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `r3`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:107:13
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 107 |         let r3 = &mut s3;
Dec 19 06:45:35.805 INFO [stderr]     |             ^^ help: consider using `_r3` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `r4`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:110:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 110 |     let r4 = &mut s3;
Dec 19 06:45:35.805 INFO [stderr]     |         ^^ help: consider using `_r4` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `r1`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:113:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 113 |     let r1 = &s; // immutable ref
Dec 19 06:45:35.805 INFO [stderr]     |         ^^ help: consider using `_r1` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `r2`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:114:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 114 |     let r2 = &s; // second because as many refs can read the same data safely
Dec 19 06:45:35.805 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:140:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 140 |     let slice = &s[0..2];   // same
Dec 19 06:45:35.805 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:141:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 141 |     let slice = &s[..2];    // same
Dec 19 06:45:35.805 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:145:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 145 |     let slice = &s[2..len]; // same
Dec 19 06:45:35.805 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:146:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 146 |     let slice = &s[2..];    // same
Dec 19 06:45:35.805 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:148:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 148 |     let slice = &s[0..len]; // same
Dec 19 06:45:35.805 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.805 INFO [stderr] 
Dec 19 06:45:35.805 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.805 INFO [stderr]    --> src/main.rs:149:9
Dec 19 06:45:35.805 INFO [stderr]     |
Dec 19 06:45:35.805 INFO [stderr] 149 |     let slice = &s[..];     // same
Dec 19 06:45:35.805 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.806 INFO [stderr] 
Dec 19 06:45:35.806 INFO [stderr] warning: unused variable: `slice`
Dec 19 06:45:35.806 INFO [stderr]    --> src/main.rs:166:9
Dec 19 06:45:35.806 INFO [stderr]     |
Dec 19 06:45:35.806 INFO [stderr] 166 |     let slice = &a[0..2];
Dec 19 06:45:35.806 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 19 06:45:35.806 INFO [stderr] 
Dec 19 06:45:35.816 INFO [stderr] warning: variable does not need to be mutable
Dec 19 06:45:35.816 INFO [stderr]    --> src/main.rs:112:9
Dec 19 06:45:35.816 INFO [stderr]     |
Dec 19 06:45:35.816 INFO [stderr] 112 |     let mut s = String::from("hello s");
Dec 19 06:45:35.816 INFO [stderr]     |         ----^
Dec 19 06:45:35.816 INFO [stderr]     |         |
Dec 19 06:45:35.816 INFO [stderr]     |         help: remove this `mut`
Dec 19 06:45:35.816 INFO [stderr]     |
Dec 19 06:45:35.816 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 19 06:45:35.816 INFO [stderr] 
Dec 19 06:45:35.856 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.25s
Dec 19 06:45:36.385 INFO running `"docker" "inspect" "2f187ab228afa002224d3202b622b03a5d4ffb23e8216af388af189f6c66f665"`
Dec 19 06:45:36.734 INFO running `"docker" "rm" "-f" "2f187ab228afa002224d3202b622b03a5d4ffb23e8216af388af189f6c66f665"`
Dec 19 06:45:36.948 INFO [stdout] 2f187ab228afa002224d3202b622b03a5d4ffb23e8216af388af189f6c66f665