[INFO] updating cached repository tperdue321/rust_ownership [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/tperdue321/rust_ownership [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/tperdue321/rust_ownership" "work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/tperdue321/rust_ownership"` [INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/tperdue321/rust_ownership'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/tperdue321/rust_ownership" "work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/tperdue321/rust_ownership"` [INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/tperdue321/rust_ownership'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 66673718162c26f2488175f590ac5890d467a7e6 [INFO] sha for GitHub repo tperdue321/rust_ownership: 66673718162c26f2488175f590ac5890d467a7e6 [INFO] validating manifest of tperdue321/rust_ownership on toolchain master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7 [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of tperdue321/rust_ownership on toolchain try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing tperdue321/rust_ownership [INFO] finished frobbing tperdue321/rust_ownership [INFO] frobbed toml for tperdue321/rust_ownership written to work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/tperdue321/rust_ownership/Cargo.toml [INFO] started frobbing tperdue321/rust_ownership [INFO] finished frobbing tperdue321/rust_ownership [INFO] frobbed toml for tperdue321/rust_ownership written to work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/tperdue321/rust_ownership/Cargo.toml [INFO] crate tperdue321/rust_ownership already has a lockfile, it will not be regenerated [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] checking tperdue321/rust_ownership against master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7 for pr-59199 [INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-59199/worker-6/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/tperdue321/rust_ownership:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] 7fb1e792c67b177cd8848b6ef214908229c3030cfbf3fe14897ca5abd8253125 [INFO] running `"docker" "start" "-a" "7fb1e792c67b177cd8848b6ef214908229c3030cfbf3fe14897ca5abd8253125"` [INFO] [stderr] Checking ownership v0.1.0 (/opt/crater/workdir) [INFO] [stderr] warning: unused variable: `string` [INFO] [stderr] --> src/main.rs:13:13 [INFO] [stderr] | [INFO] [stderr] 13 | let string = "hello"; // string is valid from here forward [INFO] [stderr] | ^^^^^^ help: consider prefixing with an underscore: `_string` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_variables)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s2` [INFO] [stderr] --> src/main.rs:40:9 [INFO] [stderr] | [INFO] [stderr] 40 | let s2 = s1; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_s2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s1` [INFO] [stderr] --> src/main.rs:68:9 [INFO] [stderr] | [INFO] [stderr] 68 | let s1 = gives_ownership(); // gives_ownership moves its return [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_s1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/main.rs:98:9 [INFO] [stderr] | [INFO] [stderr] 98 | let r1 = &mut s2; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r3` [INFO] [stderr] --> src/main.rs:107:13 [INFO] [stderr] | [INFO] [stderr] 107 | let r3 = &mut s3; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r4` [INFO] [stderr] --> src/main.rs:110:9 [INFO] [stderr] | [INFO] [stderr] 110 | let r4 = &mut s3; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r4` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/main.rs:113:9 [INFO] [stderr] | [INFO] [stderr] 113 | let r1 = &s; // immutable ref [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/main.rs:114:9 [INFO] [stderr] | [INFO] [stderr] 114 | let r2 = &s; // second because as many refs can read the same data safely [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:140:9 [INFO] [stderr] | [INFO] [stderr] 140 | let slice = &s[0..2]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:141:9 [INFO] [stderr] | [INFO] [stderr] 141 | let slice = &s[..2]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:145:9 [INFO] [stderr] | [INFO] [stderr] 145 | let slice = &s[2..len]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:146:9 [INFO] [stderr] | [INFO] [stderr] 146 | let slice = &s[2..]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:148:9 [INFO] [stderr] | [INFO] [stderr] 148 | let slice = &s[0..len]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:149:9 [INFO] [stderr] | [INFO] [stderr] 149 | let slice = &s[..]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:166:9 [INFO] [stderr] | [INFO] [stderr] 166 | let slice = &a[0..2]; [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `string` [INFO] [stderr] --> src/main.rs:13:13 [INFO] [stderr] | [INFO] [stderr] 13 | let string = "hello"; // string is valid from here forward [INFO] [stderr] | ^^^^^^ help: consider prefixing with an underscore: `_string` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_variables)] on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s2` [INFO] [stderr] --> src/main.rs:40:9 [INFO] [stderr] | [INFO] [stderr] 40 | let s2 = s1; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_s2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s1` [INFO] [stderr] --> src/main.rs:68:9 [INFO] [stderr] | [INFO] [stderr] 68 | let s1 = gives_ownership(); // gives_ownership moves its return [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_s1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/main.rs:98:9 [INFO] [stderr] | [INFO] [stderr] 98 | let r1 = &mut s2; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r3` [INFO] [stderr] --> src/main.rs:107:13 [INFO] [stderr] | [INFO] [stderr] 107 | let r3 = &mut s3; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r3` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r4` [INFO] [stderr] --> src/main.rs:110:9 [INFO] [stderr] | [INFO] [stderr] 110 | let r4 = &mut s3; [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r4` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r1` [INFO] [stderr] --> src/main.rs:113:9 [INFO] [stderr] | [INFO] [stderr] 113 | let r1 = &s; // immutable ref [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r1` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `r2` [INFO] [stderr] --> src/main.rs:114:9 [INFO] [stderr] | [INFO] [stderr] 114 | let r2 = &s; // second because as many refs can read the same data safely [INFO] [stderr] | ^^ help: consider prefixing with an underscore: `_r2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:140:9 [INFO] [stderr] | [INFO] [stderr] 140 | let slice = &s[0..2]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:141:9 [INFO] [stderr] | [INFO] [stderr] 141 | let slice = &s[..2]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:145:9 [INFO] [stderr] | [INFO] [stderr] 145 | let slice = &s[2..len]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:146:9 [INFO] [stderr] | [INFO] [stderr] 146 | let slice = &s[2..]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:148:9 [INFO] [stderr] | [INFO] [stderr] 148 | let slice = &s[0..len]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:149:9 [INFO] [stderr] | [INFO] [stderr] 149 | let slice = &s[..]; // same [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `slice` [INFO] [stderr] --> src/main.rs:166:9 [INFO] [stderr] | [INFO] [stderr] 166 | let slice = &a[0..2]; [INFO] [stderr] | ^^^^^ help: consider prefixing with an underscore: `_slice` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:112:9 [INFO] [stderr] | [INFO] [stderr] 112 | let mut s = String::from("hello s"); [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_mut)] on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/main.rs:112:9 [INFO] [stderr] | [INFO] [stderr] 112 | let mut s = String::from("hello s"); [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_mut)] on by default [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.21s [INFO] running `"docker" "inspect" "7fb1e792c67b177cd8848b6ef214908229c3030cfbf3fe14897ca5abd8253125"` [INFO] running `"docker" "rm" "-f" "7fb1e792c67b177cd8848b6ef214908229c3030cfbf3fe14897ca5abd8253125"` [INFO] [stdout] 7fb1e792c67b177cd8848b6ef214908229c3030cfbf3fe14897ca5abd8253125