[INFO] fetching crate cargo-asm 0.1.16...
[INFO] checking cargo-asm-0.1.16 against try#8d0c454bea9d9cc2cc7e288388f3b7d1da19c04f for pr-114559
[INFO] extracting crate cargo-asm 0.1.16 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate cargo-asm 0.1.16 on toolchain 8d0c454bea9d9cc2cc7e288388f3b7d1da19c04f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8d0c454bea9d9cc2cc7e288388f3b7d1da19c04f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cargo-asm 0.1.16
[INFO] finished tweaking crates.io crate cargo-asm 0.1.16
[INFO] tweaked toml for crates.io crate cargo-asm 0.1.16 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8d0c454bea9d9cc2cc7e288388f3b7d1da19c04f" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8d0c454bea9d9cc2cc7e288388f3b7d1da19c04f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: file `/workspace/builds/worker-1-tc2/source/src/main.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `bin` target `cargo-asm`
[INFO] [stderr]   * `bin` target `cargo-llvm-ir`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5c16f4e6c37141f9fef0bc86f7a492d732943053e42aab8461035881e3f53823" "/opt/rustwide/cargo-home/bin/cargo" "+8d0c454bea9d9cc2cc7e288388f3b7d1da19c04f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 90f938efa141f6f50a78c17fab700928fdd3377c3002cc6955141536f826ae35
[INFO] running `Command { std: "docker" "start" "-a" "90f938efa141f6f50a78c17fab700928fdd3377c3002cc6955141536f826ae35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "90f938efa141f6f50a78c17fab700928fdd3377c3002cc6955141536f826ae35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90f938efa141f6f50a78c17fab700928fdd3377c3002cc6955141536f826ae35", kill_on_drop: false }`
[INFO] [stdout] 90f938efa141f6f50a78c17fab700928fdd3377c3002cc6955141536f826ae35
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5c16f4e6c37141f9fef0bc86f7a492d732943053e42aab8461035881e3f53823" "/opt/rustwide/cargo-home/bin/cargo" "+8d0c454bea9d9cc2cc7e288388f3b7d1da19c04f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 44534c353d1af74bdc4f05f11185742dec30807eb419a0fbbf27ff4dec5b118a
[INFO] running `Command { std: "docker" "start" "-a" "44534c353d1af74bdc4f05f11185742dec30807eb419a0fbbf27ff4dec5b118a", kill_on_drop: false }`
[INFO] [stderr] warning: file `/opt/rustwide/workdir/src/main.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `bin` target `cargo-asm`
[INFO] [stderr]   * `bin` target `cargo-llvm-ir`
[INFO] [stderr]    Compiling serde_json v1.0.104
[INFO] [stderr]    Compiling camino v1.1.6
[INFO] [stderr]    Compiling semver v1.0.18
[INFO] [stderr]    Compiling linux-raw-sys v0.4.5
[INFO] [stderr]    Compiling bitflags v2.3.3
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]    Compiling pulldown-cmark v0.9.3
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling cargo-platform v0.1.3
[INFO] [stderr]    Compiling fastrand v2.0.0
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling bytecount v0.6.3
[INFO] [stderr]     Checking owning_ref v0.3.3
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking edit-distance v2.1.0
[INFO] [stderr]     Checking termcolor v0.3.6
[INFO] [stderr]     Checking colored v1.9.4
[INFO] [stderr]     Checking error-chain v0.11.0
[INFO] [stderr]     Checking environment v0.1.1
[INFO] [stderr]     Checking difference v1.0.0
[INFO] [stderr]    Compiling rustix v0.38.7
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]     Checking parking_lot v0.5.5
[INFO] [stderr]    Compiling cargo_metadata v0.14.2
[INFO] [stderr]    Compiling structopt-derive v0.2.18
[INFO] [stderr]    Compiling tempfile v3.7.1
[INFO] [stderr]    Compiling skeptic v0.13.7
[INFO] [stderr]    Compiling assert_cli v0.5.4
[INFO] [stderr]     Checking structopt v0.2.18
[INFO] [stderr]     Checking cargo-asm v0.1.16 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/main.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/main.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]  --> src/llvmir.rs:7:42
[INFO] [stdout]   |
[INFO] [stdout] 7 |         debug!("Scanning file: {:?}", f);;
[INFO] [stdout]   |                                          ^ help: remove this semicolon
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/options.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         { ::parking_lot::RwLock::new(read()) };
[INFO] [stdout]    |         ^^                                  ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 11 -         { ::parking_lot::RwLock::new(read()) };
[INFO] [stdout] 11 +         ::parking_lot::RwLock::new(read());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust.rs:84:49
[INFO] [stdout]    |
[INFO] [stdout] 84 |     debug!("Done inserting files: {:?}", files);;
[INFO] [stdout]    |                                                 ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:104:55
[INFO] [stdout]     |
[INFO] [stdout] 104 |     debug!("Done filing holes in files: {:?}", files);;
[INFO] [stdout]     |                                                       ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:109:59
[INFO] [stdout]     |
[INFO] [stdout] 109 |     debug!("Done correcting paths in files: {:?}", files);;
[INFO] [stdout]     |                                                           ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:129:56
[INFO] [stdout]     |
[INFO] [stdout] 129 |     debug!("Done reading lines in files: {:?}", files);;
[INFO] [stdout]     |                                                        ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust.rs:80:42
[INFO] [stdout]    |
[INFO] [stdout] 80 |             debug!("files: {:?}", files);;
[INFO] [stdout]    |                                          ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]  --> src/llvmir.rs:7:42
[INFO] [stdout]   |
[INFO] [stdout] 7 |         debug!("Scanning file: {:?}", f);;
[INFO] [stdout]   |                                          ^ help: remove this semicolon
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/options.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         { ::parking_lot::RwLock::new(read()) };
[INFO] [stdout]    |         ^^                                  ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 11 -         { ::parking_lot::RwLock::new(read()) };
[INFO] [stdout] 11 +         ::parking_lot::RwLock::new(read());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust.rs:84:49
[INFO] [stdout]    |
[INFO] [stdout] 84 |     debug!("Done inserting files: {:?}", files);;
[INFO] [stdout]    |                                                 ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:104:55
[INFO] [stdout]     |
[INFO] [stdout] 104 |     debug!("Done filing holes in files: {:?}", files);;
[INFO] [stdout]     |                                                       ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:109:59
[INFO] [stdout]     |
[INFO] [stdout] 109 |     debug!("Done correcting paths in files: {:?}", files);;
[INFO] [stdout]     |                                                           ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:129:56
[INFO] [stdout]     |
[INFO] [stdout] 129 |     debug!("Done reading lines in files: {:?}", files);;
[INFO] [stdout]     |                                                        ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust.rs:80:42
[INFO] [stdout]    |
[INFO] [stdout] 80 |             debug!("files: {:?}", files);;
[INFO] [stdout]    |                                          ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/rust.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut prev = 0;
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/rust.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut prev = 0;
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Path::parent` that must be used
[INFO] [stdout]    --> src/rust.rs:165:5
[INFO] [stdout]     |
[INFO] [stdout] 165 |     sysroot.parent();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 165 |     let _ = sysroot.parent();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Path::parent` that must be used
[INFO] [stdout]    --> src/rust.rs:165:5
[INFO] [stdout]     |
[INFO] [stdout] 165 |     sysroot.parent();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 165 |     let _ = sysroot.parent();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/main.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]  --> src/llvmir.rs:7:42
[INFO] [stdout]   |
[INFO] [stdout] 7 |         debug!("Scanning file: {:?}", f);;
[INFO] [stdout]   |                                          ^ help: remove this semicolon
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/options.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         { ::parking_lot::RwLock::new(read()) };
[INFO] [stdout]    |         ^^                                  ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 11 -         { ::parking_lot::RwLock::new(read()) };
[INFO] [stdout] 11 +         ::parking_lot::RwLock::new(read());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust.rs:84:49
[INFO] [stdout]    |
[INFO] [stdout] 84 |     debug!("Done inserting files: {:?}", files);;
[INFO] [stdout]    |                                                 ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:104:55
[INFO] [stdout]     |
[INFO] [stdout] 104 |     debug!("Done filing holes in files: {:?}", files);;
[INFO] [stdout]     |                                                       ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:109:59
[INFO] [stdout]     |
[INFO] [stdout] 109 |     debug!("Done correcting paths in files: {:?}", files);;
[INFO] [stdout]     |                                                           ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:129:56
[INFO] [stdout]     |
[INFO] [stdout] 129 |     debug!("Done reading lines in files: {:?}", files);;
[INFO] [stdout]     |                                                        ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust.rs:80:42
[INFO] [stdout]    |
[INFO] [stdout] 80 |             debug!("files: {:?}", files);;
[INFO] [stdout]    |                                          ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]   --> src/main.rs:20:1
[INFO] [stdout]    |
[INFO] [stdout] 20 | #[macro_use]
[INFO] [stdout]    | ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]  --> src/llvmir.rs:7:42
[INFO] [stdout]   |
[INFO] [stdout] 7 |         debug!("Scanning file: {:?}", f);;
[INFO] [stdout]   |                                          ^ help: remove this semicolon
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/options.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         { ::parking_lot::RwLock::new(read()) };
[INFO] [stdout]    |         ^^                                  ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 11 -         { ::parking_lot::RwLock::new(read()) };
[INFO] [stdout] 11 +         ::parking_lot::RwLock::new(read());
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust.rs:84:49
[INFO] [stdout]    |
[INFO] [stdout] 84 |     debug!("Done inserting files: {:?}", files);;
[INFO] [stdout]    |                                                 ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:104:55
[INFO] [stdout]     |
[INFO] [stdout] 104 |     debug!("Done filing holes in files: {:?}", files);;
[INFO] [stdout]     |                                                       ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:109:59
[INFO] [stdout]     |
[INFO] [stdout] 109 |     debug!("Done correcting paths in files: {:?}", files);;
[INFO] [stdout]     |                                                           ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/rust.rs:129:56
[INFO] [stdout]     |
[INFO] [stdout] 129 |     debug!("Done reading lines in files: {:?}", files);;
[INFO] [stdout]     |                                                        ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/rust.rs:80:42
[INFO] [stdout]    |
[INFO] [stdout] 80 |             debug!("files: {:?}", files);;
[INFO] [stdout]    |                                          ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/rust.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut prev = 0;
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Path::parent` that must be used
[INFO] [stdout]    --> src/rust.rs:165:5
[INFO] [stdout]     |
[INFO] [stdout] 165 |     sysroot.parent();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 165 |     let _ = sysroot.parent();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/rust.rs:90:13
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let mut prev = 0;
[INFO] [stdout]    |             ----^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Path::parent` that must be used
[INFO] [stdout]    --> src/rust.rs:165:5
[INFO] [stdout]     |
[INFO] [stdout] 165 |     sysroot.parent();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 165 |     let _ = sysroot.parent();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.98s
[INFO] running `Command { std: "docker" "inspect" "44534c353d1af74bdc4f05f11185742dec30807eb419a0fbbf27ff4dec5b118a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44534c353d1af74bdc4f05f11185742dec30807eb419a0fbbf27ff4dec5b118a", kill_on_drop: false }`
[INFO] [stdout] 44534c353d1af74bdc4f05f11185742dec30807eb419a0fbbf27ff4dec5b118a
