Dec 17 13:14:05.822 INFO checking tperdue321/rust_ownership against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 13:14:05.822 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 13:14:06.271 INFO [stdout] 2b44fd996e09d2a6994cff547ace18de5ee9c39cbad005d4d6a09495305d67e7
Dec 17 13:14:06.272 INFO running `"docker" "start" "-a" "2b44fd996e09d2a6994cff547ace18de5ee9c39cbad005d4d6a09495305d67e7"`
Dec 17 13:14:07.600 INFO [stderr]     Checking ownership v0.1.0 (/opt/crater/workdir)
Dec 17 13:14:07.852 INFO [stderr] warning: unused variable: `string`
Dec 17 13:14:07.852 INFO [stderr]   --> src/main.rs:13:13
Dec 17 13:14:07.852 INFO [stderr]    |
Dec 17 13:14:07.852 INFO [stderr] 13 |         let string = "hello"; // string is valid from here forward
Dec 17 13:14:07.852 INFO [stderr]    |             ^^^^^^ help: consider using `_string` instead
Dec 17 13:14:07.852 INFO [stderr]    |
Dec 17 13:14:07.852 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 17 13:14:07.852 INFO [stderr] 
Dec 17 13:14:07.852 INFO [stderr] warning: unused variable: `s2`
Dec 17 13:14:07.852 INFO [stderr]   --> src/main.rs:40:9
Dec 17 13:14:07.852 INFO [stderr]    |
Dec 17 13:14:07.852 INFO [stderr] 40 |     let s2 = s1;
Dec 17 13:14:07.852 INFO [stderr]    |         ^^ help: consider using `_s2` instead
Dec 17 13:14:07.852 INFO [stderr] 
Dec 17 13:14:07.852 INFO [stderr] warning: unused variable: `s1`
Dec 17 13:14:07.852 INFO [stderr]   --> src/main.rs:68:9
Dec 17 13:14:07.852 INFO [stderr]    |
Dec 17 13:14:07.852 INFO [stderr] 68 |     let s1 = gives_ownership();         // gives_ownership moves its return
Dec 17 13:14:07.852 INFO [stderr]    |         ^^ help: consider using `_s1` instead
Dec 17 13:14:07.852 INFO [stderr] 
Dec 17 13:14:07.852 INFO [stderr] warning: unused variable: `r1`
Dec 17 13:14:07.852 INFO [stderr]   --> src/main.rs:98:9
Dec 17 13:14:07.852 INFO [stderr]    |
Dec 17 13:14:07.852 INFO [stderr] 98 |     let r1 = &mut s2;
Dec 17 13:14:07.852 INFO [stderr]    |         ^^ help: consider using `_r1` instead
Dec 17 13:14:07.852 INFO [stderr] 
Dec 17 13:14:07.852 INFO [stderr] warning: unused variable: `r3`
Dec 17 13:14:07.852 INFO [stderr]    --> src/main.rs:107:13
Dec 17 13:14:07.852 INFO [stderr]     |
Dec 17 13:14:07.852 INFO [stderr] 107 |         let r3 = &mut s3;
Dec 17 13:14:07.852 INFO [stderr]     |             ^^ help: consider using `_r3` instead
Dec 17 13:14:07.852 INFO [stderr] 
Dec 17 13:14:07.852 INFO [stderr] warning: unused variable: `r4`
Dec 17 13:14:07.852 INFO [stderr]    --> src/main.rs:110:9
Dec 17 13:14:07.852 INFO [stderr]     |
Dec 17 13:14:07.852 INFO [stderr] 110 |     let r4 = &mut s3;
Dec 17 13:14:07.852 INFO [stderr]     |         ^^ help: consider using `_r4` instead
Dec 17 13:14:07.852 INFO [stderr] 
Dec 17 13:14:07.852 INFO [stderr] warning: unused variable: `r1`
Dec 17 13:14:07.852 INFO [stderr]    --> src/main.rs:113:9
Dec 17 13:14:07.852 INFO [stderr]     |
Dec 17 13:14:07.852 INFO [stderr] 113 |     let r1 = &s; // immutable ref
Dec 17 13:14:07.852 INFO [stderr]     |         ^^ help: consider using `_r1` instead
Dec 17 13:14:07.852 INFO [stderr] 
Dec 17 13:14:07.852 INFO [stderr] warning: unused variable: `r2`
Dec 17 13:14:07.852 INFO [stderr]    --> src/main.rs:114:9
Dec 17 13:14:07.853 INFO [stderr]     |
Dec 17 13:14:07.853 INFO [stderr] 114 |     let r2 = &s; // second because as many refs can read the same data safely
Dec 17 13:14:07.853 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Dec 17 13:14:07.853 INFO [stderr] 
Dec 17 13:14:07.853 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.853 INFO [stderr]    --> src/main.rs:140:9
Dec 17 13:14:07.853 INFO [stderr]     |
Dec 17 13:14:07.853 INFO [stderr] 140 |     let slice = &s[0..2];   // same
Dec 17 13:14:07.853 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.853 INFO [stderr] 
Dec 17 13:14:07.853 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.853 INFO [stderr]    --> src/main.rs:141:9
Dec 17 13:14:07.853 INFO [stderr]     |
Dec 17 13:14:07.853 INFO [stderr] 141 |     let slice = &s[..2];    // same
Dec 17 13:14:07.853 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.853 INFO [stderr] 
Dec 17 13:14:07.853 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.853 INFO [stderr]    --> src/main.rs:145:9
Dec 17 13:14:07.853 INFO [stderr]     |
Dec 17 13:14:07.853 INFO [stderr] 145 |     let slice = &s[2..len]; // same
Dec 17 13:14:07.853 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.853 INFO [stderr] 
Dec 17 13:14:07.853 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.853 INFO [stderr]    --> src/main.rs:146:9
Dec 17 13:14:07.853 INFO [stderr]     |
Dec 17 13:14:07.853 INFO [stderr] 146 |     let slice = &s[2..];    // same
Dec 17 13:14:07.853 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.853 INFO [stderr] 
Dec 17 13:14:07.853 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.853 INFO [stderr]    --> src/main.rs:148:9
Dec 17 13:14:07.853 INFO [stderr]     |
Dec 17 13:14:07.853 INFO [stderr] 148 |     let slice = &s[0..len]; // same
Dec 17 13:14:07.853 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.853 INFO [stderr] 
Dec 17 13:14:07.853 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.853 INFO [stderr]    --> src/main.rs:149:9
Dec 17 13:14:07.853 INFO [stderr]     |
Dec 17 13:14:07.853 INFO [stderr] 149 |     let slice = &s[..];     // same
Dec 17 13:14:07.853 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.853 INFO [stderr] 
Dec 17 13:14:07.853 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.853 INFO [stderr]    --> src/main.rs:166:9
Dec 17 13:14:07.853 INFO [stderr]     |
Dec 17 13:14:07.853 INFO [stderr] 166 |     let slice = &a[0..2];
Dec 17 13:14:07.853 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.853 INFO [stderr] 
Dec 17 13:14:07.872 INFO [stderr] warning: variable does not need to be mutable
Dec 17 13:14:07.872 INFO [stderr]    --> src/main.rs:112:9
Dec 17 13:14:07.872 INFO [stderr]     |
Dec 17 13:14:07.872 INFO [stderr] 112 |     let mut s = String::from("hello s");
Dec 17 13:14:07.872 INFO [stderr]     |         ----^
Dec 17 13:14:07.872 INFO [stderr]     |         |
Dec 17 13:14:07.872 INFO [stderr]     |         help: remove this `mut`
Dec 17 13:14:07.872 INFO [stderr]     |
Dec 17 13:14:07.872 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 17 13:14:07.872 INFO [stderr] 
Dec 17 13:14:07.896 INFO [stderr] warning: unused variable: `string`
Dec 17 13:14:07.896 INFO [stderr]   --> src/main.rs:13:13
Dec 17 13:14:07.896 INFO [stderr]    |
Dec 17 13:14:07.897 INFO [stderr] 13 |         let string = "hello"; // string is valid from here forward
Dec 17 13:14:07.897 INFO [stderr]    |             ^^^^^^ help: consider using `_string` instead
Dec 17 13:14:07.897 INFO [stderr]    |
Dec 17 13:14:07.897 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `s2`
Dec 17 13:14:07.897 INFO [stderr]   --> src/main.rs:40:9
Dec 17 13:14:07.897 INFO [stderr]    |
Dec 17 13:14:07.897 INFO [stderr] 40 |     let s2 = s1;
Dec 17 13:14:07.897 INFO [stderr]    |         ^^ help: consider using `_s2` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `s1`
Dec 17 13:14:07.897 INFO [stderr]   --> src/main.rs:68:9
Dec 17 13:14:07.897 INFO [stderr]    |
Dec 17 13:14:07.897 INFO [stderr] 68 |     let s1 = gives_ownership();         // gives_ownership moves its return
Dec 17 13:14:07.897 INFO [stderr]    |         ^^ help: consider using `_s1` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `r1`
Dec 17 13:14:07.897 INFO [stderr]   --> src/main.rs:98:9
Dec 17 13:14:07.897 INFO [stderr]    |
Dec 17 13:14:07.897 INFO [stderr] 98 |     let r1 = &mut s2;
Dec 17 13:14:07.897 INFO [stderr]    |         ^^ help: consider using `_r1` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `r3`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:107:13
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 107 |         let r3 = &mut s3;
Dec 17 13:14:07.897 INFO [stderr]     |             ^^ help: consider using `_r3` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `r4`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:110:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 110 |     let r4 = &mut s3;
Dec 17 13:14:07.897 INFO [stderr]     |         ^^ help: consider using `_r4` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `r1`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:113:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 113 |     let r1 = &s; // immutable ref
Dec 17 13:14:07.897 INFO [stderr]     |         ^^ help: consider using `_r1` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `r2`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:114:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 114 |     let r2 = &s; // second because as many refs can read the same data safely
Dec 17 13:14:07.897 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:140:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 140 |     let slice = &s[0..2];   // same
Dec 17 13:14:07.897 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:141:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 141 |     let slice = &s[..2];    // same
Dec 17 13:14:07.897 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:145:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 145 |     let slice = &s[2..len]; // same
Dec 17 13:14:07.897 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:146:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 146 |     let slice = &s[2..];    // same
Dec 17 13:14:07.897 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:148:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 148 |     let slice = &s[0..len]; // same
Dec 17 13:14:07.897 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:149:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 149 |     let slice = &s[..];     // same
Dec 17 13:14:07.897 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.897 INFO [stderr] warning: unused variable: `slice`
Dec 17 13:14:07.897 INFO [stderr]    --> src/main.rs:166:9
Dec 17 13:14:07.897 INFO [stderr]     |
Dec 17 13:14:07.897 INFO [stderr] 166 |     let slice = &a[0..2];
Dec 17 13:14:07.897 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 17 13:14:07.897 INFO [stderr] 
Dec 17 13:14:07.912 INFO [stderr] warning: variable does not need to be mutable
Dec 17 13:14:07.912 INFO [stderr]    --> src/main.rs:112:9
Dec 17 13:14:07.912 INFO [stderr]     |
Dec 17 13:14:07.912 INFO [stderr] 112 |     let mut s = String::from("hello s");
Dec 17 13:14:07.912 INFO [stderr]     |         ----^
Dec 17 13:14:07.912 INFO [stderr]     |         |
Dec 17 13:14:07.912 INFO [stderr]     |         help: remove this `mut`
Dec 17 13:14:07.912 INFO [stderr]     |
Dec 17 13:14:07.912 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 17 13:14:07.912 INFO [stderr] 
Dec 17 13:14:07.935 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.35s
Dec 17 13:14:08.382 INFO running `"docker" "inspect" "2b44fd996e09d2a6994cff547ace18de5ee9c39cbad005d4d6a09495305d67e7"`
Dec 17 13:14:08.562 INFO running `"docker" "rm" "-f" "2b44fd996e09d2a6994cff547ace18de5ee9c39cbad005d4d6a09495305d67e7"`
Dec 17 13:14:08.794 INFO [stdout] 2b44fd996e09d2a6994cff547ace18de5ee9c39cbad005d4d6a09495305d67e7