[INFO] cloning repository https://github.com/irawanfirmansyah/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/irawanfirmansyah/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Firawanfirmansyah%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Firawanfirmansyah%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 841f3e0ad062d361d93341cc95788536e330ada9
[INFO] linting irawanfirmansyah/rust-playground against nightly for clippy-nonminimal_bool-denied
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Firawanfirmansyah%2Frust-playground" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/irawanfirmansyah/rust-playground
[INFO] finished tweaking git repo https://github.com/irawanfirmansyah/rust-playground
[INFO] tweaked toml for git repo https://github.com/irawanfirmansyah/rust-playground written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/irawanfirmansyah/rust-playground on toolchain nightly
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/irawanfirmansyah/rust-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 12d1f6af3403509a20e130258af7b737243be5f8c6de12bf13049421fd899ad5
[INFO] running `Command { std: "docker" "start" "-a" "12d1f6af3403509a20e130258af7b737243be5f8c6de12bf13049421fd899ad5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12d1f6af3403509a20e130258af7b737243be5f8c6de12bf13049421fd899ad5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12d1f6af3403509a20e130258af7b737243be5f8c6de12bf13049421fd899ad5", kill_on_drop: false }`
[INFO] [stdout] 12d1f6af3403509a20e130258af7b737243be5f8c6de12bf13049421fd899ad5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "clippy" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6c9417070d41e1c2b18f4edf4a27010a833ed05ce380f8ee23831fd5d7efa3a4
[INFO] running `Command { std: "docker" "start" "-a" "6c9417070d41e1c2b18f4edf4a27010a833ed05ce380f8ee23831fd5d7efa3a4", kill_on_drop: false }`
[INFO] [stderr]     Checking playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/fibonacci.rs:18:3
[INFO] [stdout]    |
[INFO] [stdout] 18 |   return tup[0] + tup[1];
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]    = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 18 -   return tup[0] + tup[1];
[INFO] [stdout] 18 +   tup[0] + tup[1]
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/solution_1.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     if !v.last().is_none() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^ help: try: `v.last().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]    = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/solution_1.rs:44:3
[INFO] [stdout]    |
[INFO] [stdout] 44 |   return *v.last().unwrap_or(&0);
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 44 -   return *v.last().unwrap_or(&0);
[INFO] [stdout] 44 +   *v.last().unwrap_or(&0)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `if` statement can be collapsed
[INFO] [stdout]   --> src/solution_1.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 | /       if last == n {
[INFO] [stdout] 26 | |         if n < num_count {
[INFO] [stdout] 27 | |           v.pop();
[INFO] [stdout] 28 | |         }
[INFO] [stdout] 29 | |       }
[INFO] [stdout]    | |_______^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stdout]    = note: `#[warn(clippy::collapsible_if)]` on by default
[INFO] [stdout] help: collapse nested if block
[INFO] [stdout]    |
[INFO] [stdout] 25 ~       if last == n
[INFO] [stdout] 26 ~         && n < num_count {
[INFO] [stdout] 27 |           v.pop();
[INFO] [stdout] 28 ~         }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `if` statement can be collapsed
[INFO] [stdout]   --> src/solution_1.rs:31:7
[INFO] [stdout]    |
[INFO] [stdout] 31 | /       if last < n {
[INFO] [stdout] 32 | |         if n == num_count {
[INFO] [stdout] 33 | |           v.push(n);
[INFO] [stdout] 34 | |         }
[INFO] [stdout] 35 | |       }
[INFO] [stdout]    | |_______^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stdout] help: collapse nested if block
[INFO] [stdout]    |
[INFO] [stdout] 31 ~       if last < n
[INFO] [stdout] 32 ~         && n == num_count {
[INFO] [stdout] 33 |           v.push(n);
[INFO] [stdout] 34 ~         }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/solution_2.rs:27:3
[INFO] [stdout]    |
[INFO] [stdout] 27 |   return mov;
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 27 -   return mov;
[INFO] [stdout] 27 +   mov
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/solution_3.rs:31:3
[INFO] [stdout]    |
[INFO] [stdout] 31 |   return map.keys().cloned().collect();
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 31 -   return map.keys().cloned().collect();
[INFO] [stdout] 31 +   map.keys().cloned().collect()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/solution_3.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     if dependencies.len() > 0 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!dependencies.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout]    = note: `#[warn(clippy::len_zero)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/fibonacci.rs:18:3
[INFO] [stdout]    |
[INFO] [stdout] 18 |   return tup[0] + tup[1];
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]    = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 18 -   return tup[0] + tup[1];
[INFO] [stdout] 18 +   tup[0] + tup[1]
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/solution_1.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |     if !v.last().is_none() {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^ help: try: `v.last().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]    = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/solution_1.rs:44:3
[INFO] [stdout]    |
[INFO] [stdout] 44 |   return *v.last().unwrap_or(&0);
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 44 -   return *v.last().unwrap_or(&0);
[INFO] [stdout] 44 +   *v.last().unwrap_or(&0)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `if` statement can be collapsed
[INFO] [stdout]   --> src/solution_1.rs:25:7
[INFO] [stdout]    |
[INFO] [stdout] 25 | /       if last == n {
[INFO] [stdout] 26 | |         if n < num_count {
[INFO] [stdout] 27 | |           v.pop();
[INFO] [stdout] 28 | |         }
[INFO] [stdout] 29 | |       }
[INFO] [stdout]    | |_______^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stdout]    = note: `#[warn(clippy::collapsible_if)]` on by default
[INFO] [stdout] help: collapse nested if block
[INFO] [stdout]    |
[INFO] [stdout] 25 ~       if last == n
[INFO] [stdout] 26 ~         && n < num_count {
[INFO] [stdout] 27 |           v.pop();
[INFO] [stdout] 28 ~         }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this `if` statement can be collapsed
[INFO] [stdout]   --> src/solution_1.rs:31:7
[INFO] [stdout]    |
[INFO] [stdout] 31 | /       if last < n {
[INFO] [stdout] 32 | |         if n == num_count {
[INFO] [stdout] 33 | |           v.push(n);
[INFO] [stdout] 34 | |         }
[INFO] [stdout] 35 | |       }
[INFO] [stdout]    | |_______^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stdout] help: collapse nested if block
[INFO] [stdout]    |
[INFO] [stdout] 31 ~       if last < n
[INFO] [stdout] 32 ~         && n == num_count {
[INFO] [stdout] 33 |           v.push(n);
[INFO] [stdout] 34 ~         }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/solution_2.rs:27:3
[INFO] [stdout]    |
[INFO] [stdout] 27 |   return mov;
[INFO] [stdout]    |   ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 27 -   return mov;
[INFO] [stdout] 27 +   mov
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/solution_3.rs:31:3
[INFO] [stdout]    |
[INFO] [stdout] 31 |   return map.keys().cloned().collect();
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 31 -   return map.keys().cloned().collect();
[INFO] [stdout] 31 +   map.keys().cloned().collect()
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/solution_3.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     if dependencies.len() > 0 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!dependencies.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout]    = note: `#[warn(clippy::len_zero)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.29s
[INFO] running `Command { std: "docker" "inspect" "6c9417070d41e1c2b18f4edf4a27010a833ed05ce380f8ee23831fd5d7efa3a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c9417070d41e1c2b18f4edf4a27010a833ed05ce380f8ee23831fd5d7efa3a4", kill_on_drop: false }`
[INFO] [stdout] 6c9417070d41e1c2b18f4edf4a27010a833ed05ce380f8ee23831fd5d7efa3a4