[INFO] updating cached repository https://github.com/modeverv/Rust2019
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b3b7168d3df254b8c9695e73c6d68531f123921d
[INFO] testing modeverv/Rust2019 against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmodeverv%2FRust2019" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/modeverv/Rust2019 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/modeverv/Rust2019
[INFO] finished tweaking git repo https://github.com/modeverv/Rust2019
[INFO] tweaked toml for git repo https://github.com/modeverv/Rust2019 written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/modeverv/Rust2019 already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 0f588bb39776dbd9fc7cab48da1e5a325226f8471067bcd08867d668800ef4d3
[INFO] running `"docker" "start" "-a" "0f588bb39776dbd9fc7cab48da1e5a325226f8471067bcd08867d668800ef4d3"`
[INFO] [stderr]    Compiling hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `xx`
[INFO] [stderr]  --> src/main.rs:6:10
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let (xx, y) = (1, 2);
[INFO] [stderr]   |          ^^ help: consider prefixing with an underscore: `_xx`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `yy`
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let yy: i32 = 5;
[INFO] [stderr]   |         ^^ help: consider prefixing with an underscore: `_yy`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `yyy` is assigned to, but never used
[INFO] [stderr]  --> src/main.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let mut yyy = 5;
[INFO] [stderr]   |             ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider using `_yyy` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `yyy` is never read
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     yyy = 10;
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `px`
[INFO] [stderr]   --> src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let px = true;
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_px`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `py`
[INFO] [stderr]   --> src/main.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let py:bool = false;
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_py`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pc`
[INFO] [stderr]   --> src/main.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let pc:char = 'x';
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_pc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `middle`
[INFO] [stderr]   --> src/main.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |     let middle = &pa[1..4]; // [1,2,3]
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_middle`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ify`
[INFO] [stderr]   --> src/main.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let ify = if x == 5 {
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_ify`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ifyy`
[INFO] [stderr]   --> src/main.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let ifyy = if x == 5 { 10 } else { 15 }; // y: i32
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_ifyy`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let mut pa = [0, 1, 2, 3, 4];
[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 0.32s
[INFO] running `"docker" "inspect" "0f588bb39776dbd9fc7cab48da1e5a325226f8471067bcd08867d668800ef4d3"`
[INFO] running `"docker" "rm" "-f" "0f588bb39776dbd9fc7cab48da1e5a325226f8471067bcd08867d668800ef4d3"`
[INFO] [stdout] 0f588bb39776dbd9fc7cab48da1e5a325226f8471067bcd08867d668800ef4d3
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] c6edad715b03195ea6389b2b1dffa1648ebd240f680e8e974e72ff30255a57ec
[INFO] running `"docker" "start" "-a" "c6edad715b03195ea6389b2b1dffa1648ebd240f680e8e974e72ff30255a57ec"`
[INFO] [stderr]    Compiling hello_world v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `xx`
[INFO] [stderr]  --> src/main.rs:6:10
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let (xx, y) = (1, 2);
[INFO] [stderr]   |          ^^ help: consider prefixing with an underscore: `_xx`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `yy`
[INFO] [stderr]  --> src/main.rs:8:9
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let yy: i32 = 5;
[INFO] [stderr]   |         ^^ help: consider prefixing with an underscore: `_yy`
[INFO] [stderr] 
[INFO] [stderr] warning: variable `yyy` is assigned to, but never used
[INFO] [stderr]  --> src/main.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let mut yyy = 5;
[INFO] [stderr]   |             ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider using `_yyy` instead
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `yyy` is never read
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     yyy = 10;
[INFO] [stderr]    |     ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `px`
[INFO] [stderr]   --> src/main.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let px = true;
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_px`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `py`
[INFO] [stderr]   --> src/main.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let py:bool = false;
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_py`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `pc`
[INFO] [stderr]   --> src/main.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |     let pc:char = 'x';
[INFO] [stderr]    |         ^^ help: consider prefixing with an underscore: `_pc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `middle`
[INFO] [stderr]   --> src/main.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |     let middle = &pa[1..4]; // [1,2,3]
[INFO] [stderr]    |         ^^^^^^ help: consider prefixing with an underscore: `_middle`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ify`
[INFO] [stderr]   --> src/main.rs:52:9
[INFO] [stderr]    |
[INFO] [stderr] 52 |     let ify = if x == 5 {
[INFO] [stderr]    |         ^^^ help: consider prefixing with an underscore: `_ify`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ifyy`
[INFO] [stderr]   --> src/main.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let ifyy = if x == 5 { 10 } else { 15 }; // y: i32
[INFO] [stderr]    |         ^^^^ help: consider prefixing with an underscore: `_ifyy`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 |     let mut pa = [0, 1, 2, 3, 4];
[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 0.57s
[INFO] running `"docker" "inspect" "c6edad715b03195ea6389b2b1dffa1648ebd240f680e8e974e72ff30255a57ec"`
[INFO] running `"docker" "rm" "-f" "c6edad715b03195ea6389b2b1dffa1648ebd240f680e8e974e72ff30255a57ec"`
[INFO] [stdout] c6edad715b03195ea6389b2b1dffa1648ebd240f680e8e974e72ff30255a57ec
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen"`
[INFO] [stdout] 9e71b593c778aa4a3f286f2e0ebe884d841bd33610a82cfd32d687ae3ae617f5
[INFO] running `"docker" "start" "-a" "9e71b593c778aa4a3f286f2e0ebe884d841bd33610a82cfd32d687ae3ae617f5"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.29s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/hello_world-a72fca4e932c4ee0
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "9e71b593c778aa4a3f286f2e0ebe884d841bd33610a82cfd32d687ae3ae617f5"`
[INFO] running `"docker" "rm" "-f" "9e71b593c778aa4a3f286f2e0ebe884d841bd33610a82cfd32d687ae3ae617f5"`
[INFO] [stdout] 9e71b593c778aa4a3f286f2e0ebe884d841bd33610a82cfd32d687ae3ae617f5