Merge branch 'clippy' into 'master'

ci/run_benchmark.sh

src/lib/parser/shell_expand/mod.rs

src/lib/parser/shell_expand/words/methods/strings.rs

src/lib/parser/shell_expand/words/mod.rs

src/lib/parser/statement/case.rs

src/lib/parser/statement/parse.rs

src/lib/shell/assignments.rs

src/lib/shell/flow.rs

src/lib/shell/fork.rs

src/lib/shell/job.rs

src/lib/shell/mod.rs

src/lib/shell/pipe_exec/job_control.rs

src/lib/shell/pipe_exec/mod.rs

src/lib/shell/signals.rs

src/lib/shell/variables/mod.rs