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Suggest to remove the semicolon of the last stmt in a block

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flip1995 2020-02-17 18:11:50 +01:00
parent 0f69cafc2d
commit f9c325f5b6
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1 changed files with 30 additions and 0 deletions
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30
clippy_lints/src/types.rs
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@ -794,6 +794,36 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UnitArg {
if !args_to_recover.is_empty() { if !args_to_recover.is_empty() {
let mut applicability = Applicability::MachineApplicable; let mut applicability = Applicability::MachineApplicable;
span_lint_and_then(cx, UNIT_ARG, expr.span, "passing a unit value to a function", |db| { span_lint_and_then(cx, UNIT_ARG, expr.span, "passing a unit value to a function", |db| {
let mut or = "";
args_to_recover
.iter()
.filter_map(|arg| {
if_chain! {
if let ExprKind::Block(block, _) = arg.kind;
if block.expr.is_none();
if let Some(last_stmt) = block.stmts.iter().last();
if let StmtKind::Semi(last_expr) = last_stmt.kind;
if let Some(snip) = snippet_opt(cx, last_expr.span);
then {
Some((
last_stmt.span,
snip,
))
}
else {
None
}
}
})
.for_each(|(span, sugg)| {
db.span_suggestion(
span,
"remove the semicolon from the last statement in the block",
sugg,
Applicability::MaybeIncorrect,
);
or = "or ";
});
let sugg = args_to_recover let sugg = args_to_recover
.iter() .iter()
.enumerate() .enumerate()