Dec 12 23:30:41.751 INFO testing tperdue321/rust_ownership against master#bd47d6825bf4090517549d33cfef10d3300b4a75 for pr-56550
Dec 12 23:30:41.752 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-4/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56550/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/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 +bd47d6825bf4090517549d33cfef10d3300b4a75-alt build --frozen" "-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 12 23:30:41.939 INFO [stdout] 4dbef36f45449864ba99e2d6ea77f291eb087edece1a1b2b9e1c0f5f3c90d010
Dec 12 23:30:41.944 INFO running `"docker" "start" "-a" "4dbef36f45449864ba99e2d6ea77f291eb087edece1a1b2b9e1c0f5f3c90d010"`
Dec 12 23:30:42.325 INFO [stderr] usermod: no changes
Dec 12 23:30:42.354 INFO [stderr]    Compiling ownership v0.1.0 (/source)
Dec 12 23:30:42.514 INFO [stderr] warning: unused variable: `string`
Dec 12 23:30:42.515 INFO [stderr]   --> src/main.rs:13:13
Dec 12 23:30:42.515 INFO [stderr]    |
Dec 12 23:30:42.515 INFO [stderr] 13 |         let string = "hello"; // string is valid from here forward
Dec 12 23:30:42.515 INFO [stderr]    |             ^^^^^^ help: consider using `_string` instead
Dec 12 23:30:42.515 INFO [stderr]    |
Dec 12 23:30:42.515 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `s2`
Dec 12 23:30:42.515 INFO [stderr]   --> src/main.rs:40:9
Dec 12 23:30:42.515 INFO [stderr]    |
Dec 12 23:30:42.515 INFO [stderr] 40 |     let s2 = s1;
Dec 12 23:30:42.515 INFO [stderr]    |         ^^ help: consider using `_s2` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `s1`
Dec 12 23:30:42.515 INFO [stderr]   --> src/main.rs:68:9
Dec 12 23:30:42.515 INFO [stderr]    |
Dec 12 23:30:42.515 INFO [stderr] 68 |     let s1 = gives_ownership();         // gives_ownership moves its return
Dec 12 23:30:42.515 INFO [stderr]    |         ^^ help: consider using `_s1` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `r1`
Dec 12 23:30:42.515 INFO [stderr]   --> src/main.rs:98:9
Dec 12 23:30:42.515 INFO [stderr]    |
Dec 12 23:30:42.515 INFO [stderr] 98 |     let r1 = &mut s2;
Dec 12 23:30:42.515 INFO [stderr]    |         ^^ help: consider using `_r1` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `r3`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:107:13
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 107 |         let r3 = &mut s3;
Dec 12 23:30:42.515 INFO [stderr]     |             ^^ help: consider using `_r3` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `r4`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:110:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 110 |     let r4 = &mut s3;
Dec 12 23:30:42.515 INFO [stderr]     |         ^^ help: consider using `_r4` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `r1`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:113:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 113 |     let r1 = &s; // immutable ref
Dec 12 23:30:42.515 INFO [stderr]     |         ^^ help: consider using `_r1` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `r2`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:114:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 114 |     let r2 = &s; // second because as many refs can read the same data safely
Dec 12 23:30:42.515 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:140:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 140 |     let slice = &s[0..2];   // same
Dec 12 23:30:42.515 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:141:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 141 |     let slice = &s[..2];    // same
Dec 12 23:30:42.515 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:145:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 145 |     let slice = &s[2..len]; // same
Dec 12 23:30:42.515 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:146:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 146 |     let slice = &s[2..];    // same
Dec 12 23:30:42.515 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:148:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 148 |     let slice = &s[0..len]; // same
Dec 12 23:30:42.515 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:42.515 INFO [stderr]    --> src/main.rs:149:9
Dec 12 23:30:42.515 INFO [stderr]     |
Dec 12 23:30:42.515 INFO [stderr] 149 |     let slice = &s[..];     // same
Dec 12 23:30:42.515 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:42.515 INFO [stderr] 
Dec 12 23:30:42.515 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:42.516 INFO [stderr]    --> src/main.rs:166:9
Dec 12 23:30:42.516 INFO [stderr]     |
Dec 12 23:30:42.516 INFO [stderr] 166 |     let slice = &a[0..2];
Dec 12 23:30:42.516 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:42.516 INFO [stderr] 
Dec 12 23:30:42.519 INFO [stderr] warning: variable does not need to be mutable
Dec 12 23:30:42.519 INFO [stderr]    --> src/main.rs:112:9
Dec 12 23:30:42.519 INFO [stderr]     |
Dec 12 23:30:42.519 INFO [stderr] 112 |     let mut s = String::from("hello s");
Dec 12 23:30:42.519 INFO [stderr]     |         ----^
Dec 12 23:30:42.519 INFO [stderr]     |         |
Dec 12 23:30:42.519 INFO [stderr]     |         help: remove this `mut`
Dec 12 23:30:42.519 INFO [stderr]     |
Dec 12 23:30:42.519 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 12 23:30:42.519 INFO [stderr] 
Dec 12 23:30:42.829 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.47s
Dec 12 23:30:42.968 INFO [stderr] su: No module specific data is present
Dec 12 23:30:43.064 INFO running `"docker" "inspect" "4dbef36f45449864ba99e2d6ea77f291eb087edece1a1b2b9e1c0f5f3c90d010"`
Dec 12 23:30:43.161 INFO running `"docker" "rm" "-f" "4dbef36f45449864ba99e2d6ea77f291eb087edece1a1b2b9e1c0f5f3c90d010"`
Dec 12 23:30:43.245 INFO [stdout] 4dbef36f45449864ba99e2d6ea77f291eb087edece1a1b2b9e1c0f5f3c90d010
Dec 12 23:30:43.247 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-4/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56550/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/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 +bd47d6825bf4090517549d33cfef10d3300b4a75-alt test --frozen --no-run" "-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 12 23:30:43.462 INFO [stdout] b687a5fe8f1f0b66a08e7f77917bd3e81341be4031c2b056083df1614c68b1cf
Dec 12 23:30:43.464 INFO running `"docker" "start" "-a" "b687a5fe8f1f0b66a08e7f77917bd3e81341be4031c2b056083df1614c68b1cf"`
Dec 12 23:30:44.062 INFO [stderr] usermod: no changes
Dec 12 23:30:44.144 INFO [stderr]    Compiling ownership v0.1.0 (/source)
Dec 12 23:30:44.359 INFO [stderr] warning: unused variable: `string`
Dec 12 23:30:44.359 INFO [stderr]   --> src/main.rs:13:13
Dec 12 23:30:44.359 INFO [stderr]    |
Dec 12 23:30:44.359 INFO [stderr] 13 |         let string = "hello"; // string is valid from here forward
Dec 12 23:30:44.359 INFO [stderr]    |             ^^^^^^ help: consider using `_string` instead
Dec 12 23:30:44.359 INFO [stderr]    |
Dec 12 23:30:44.359 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 12 23:30:44.359 INFO [stderr] 
Dec 12 23:30:44.359 INFO [stderr] warning: unused variable: `s2`
Dec 12 23:30:44.359 INFO [stderr]   --> src/main.rs:40:9
Dec 12 23:30:44.359 INFO [stderr]    |
Dec 12 23:30:44.360 INFO [stderr] 40 |     let s2 = s1;
Dec 12 23:30:44.360 INFO [stderr]    |         ^^ help: consider using `_s2` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `s1`
Dec 12 23:30:44.360 INFO [stderr]   --> src/main.rs:68:9
Dec 12 23:30:44.360 INFO [stderr]    |
Dec 12 23:30:44.360 INFO [stderr] 68 |     let s1 = gives_ownership();         // gives_ownership moves its return
Dec 12 23:30:44.360 INFO [stderr]    |         ^^ help: consider using `_s1` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `r1`
Dec 12 23:30:44.360 INFO [stderr]   --> src/main.rs:98:9
Dec 12 23:30:44.360 INFO [stderr]    |
Dec 12 23:30:44.360 INFO [stderr] 98 |     let r1 = &mut s2;
Dec 12 23:30:44.360 INFO [stderr]    |         ^^ help: consider using `_r1` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `r3`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:107:13
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 107 |         let r3 = &mut s3;
Dec 12 23:30:44.360 INFO [stderr]     |             ^^ help: consider using `_r3` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `r4`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:110:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 110 |     let r4 = &mut s3;
Dec 12 23:30:44.360 INFO [stderr]     |         ^^ help: consider using `_r4` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `r1`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:113:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 113 |     let r1 = &s; // immutable ref
Dec 12 23:30:44.360 INFO [stderr]     |         ^^ help: consider using `_r1` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `r2`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:114:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 114 |     let r2 = &s; // second because as many refs can read the same data safely
Dec 12 23:30:44.360 INFO [stderr]     |         ^^ help: consider using `_r2` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:140:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 140 |     let slice = &s[0..2];   // same
Dec 12 23:30:44.360 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:141:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 141 |     let slice = &s[..2];    // same
Dec 12 23:30:44.360 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:145:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 145 |     let slice = &s[2..len]; // same
Dec 12 23:30:44.360 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:146:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 146 |     let slice = &s[2..];    // same
Dec 12 23:30:44.360 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:148:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 148 |     let slice = &s[0..len]; // same
Dec 12 23:30:44.360 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:149:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 149 |     let slice = &s[..];     // same
Dec 12 23:30:44.360 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.360 INFO [stderr] warning: unused variable: `slice`
Dec 12 23:30:44.360 INFO [stderr]    --> src/main.rs:166:9
Dec 12 23:30:44.360 INFO [stderr]     |
Dec 12 23:30:44.360 INFO [stderr] 166 |     let slice = &a[0..2];
Dec 12 23:30:44.360 INFO [stderr]     |         ^^^^^ help: consider using `_slice` instead
Dec 12 23:30:44.360 INFO [stderr] 
Dec 12 23:30:44.379 INFO [stderr] warning: variable does not need to be mutable
Dec 12 23:30:44.379 INFO [stderr]    --> src/main.rs:112:9
Dec 12 23:30:44.379 INFO [stderr]     |
Dec 12 23:30:44.379 INFO [stderr] 112 |     let mut s = String::from("hello s");
Dec 12 23:30:44.379 INFO [stderr]     |         ----^
Dec 12 23:30:44.379 INFO [stderr]     |         |
Dec 12 23:30:44.379 INFO [stderr]     |         help: remove this `mut`
Dec 12 23:30:44.379 INFO [stderr]     |
Dec 12 23:30:44.379 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 12 23:30:44.379 INFO [stderr] 
Dec 12 23:30:44.654 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.54s
Dec 12 23:30:44.655 INFO [stderr] su: No module specific data is present
Dec 12 23:30:44.983 INFO running `"docker" "inspect" "b687a5fe8f1f0b66a08e7f77917bd3e81341be4031c2b056083df1614c68b1cf"`
Dec 12 23:30:45.056 INFO running `"docker" "rm" "-f" "b687a5fe8f1f0b66a08e7f77917bd3e81341be4031c2b056083df1614c68b1cf"`
Dec 12 23:30:45.163 INFO [stdout] b687a5fe8f1f0b66a08e7f77917bd3e81341be4031c2b056083df1614c68b1cf
Dec 12 23:30:45.166 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-4/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56550/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/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 +bd47d6825bf4090517549d33cfef10d3300b4a75-alt test --frozen" "-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 12 23:30:45.348 INFO [stdout] cc066163387116641c805e1fe7021ce97e584d24f41166b3cd57d5c78d02dbd9
Dec 12 23:30:45.350 INFO running `"docker" "start" "-a" "cc066163387116641c805e1fe7021ce97e584d24f41166b3cd57d5c78d02dbd9"`
Dec 12 23:30:45.789 INFO [stderr] usermod: no changes
Dec 12 23:30:45.814 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.00s
Dec 12 23:30:45.814 INFO [stderr]      Running /target/debug/deps/ownership-399de08460357831
Dec 12 23:30:45.816 INFO [stdout] 
Dec 12 23:30:45.816 INFO [stdout] running 0 tests
Dec 12 23:30:45.816 INFO [stdout] 
Dec 12 23:30:45.816 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 12 23:30:45.816 INFO [stdout] 
Dec 12 23:30:45.818 INFO [stderr] su: No module specific data is present
Dec 12 23:30:46.057 INFO running `"docker" "inspect" "cc066163387116641c805e1fe7021ce97e584d24f41166b3cd57d5c78d02dbd9"`
Dec 12 23:30:46.220 INFO running `"docker" "rm" "-f" "cc066163387116641c805e1fe7021ce97e584d24f41166b3cd57d5c78d02dbd9"`
Dec 12 23:30:46.338 INFO [stdout] cc066163387116641c805e1fe7021ce97e584d24f41166b3cd57d5c78d02dbd9