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Don't warn about parentheses on match (return)

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This commit is contained in:
varkor 2018-10-17 23:51:01 +01:00
parent 5ea8eb55cd
commit 0a858dc859
2 changed files with 14 additions and 5 deletions
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13
src/librustc_lint/unused.rs
View File

@ -276,10 +276,13 @@ impl UnusedParens {
cx: &EarlyContext,
value: &ast::Expr,
msg: &str,
struct_lit_needs_parens: bool) {
followed_by_block: bool) {
if let ast::ExprKind::Paren(ref inner) = value.node {
let necessary = struct_lit_needs_parens &&
parser::contains_exterior_struct_lit(&inner);
let necessary = followed_by_block && if let ast::ExprKind::Ret(_) = inner.node {
true
} else {
parser::contains_exterior_struct_lit(&inner)
};
if !necessary {
let pattern = pprust::expr_to_string(value);
Self::remove_outer_parens(cx, value.span, &pattern, msg);
@ -343,7 +346,7 @@ impl LintPass for UnusedParens {
impl EarlyLintPass for UnusedParens {
fn check_expr(&mut self, cx: &EarlyContext, e: &ast::Expr) {
use syntax::ast::ExprKind::*;
let (value, msg, struct_lit_needs_parens) = match e.node {
let (value, msg, followed_by_block) = match e.node {
If(ref cond, ..) => (cond, "`if` condition", true),
While(ref cond, ..) => (cond, "`while` condition", true),
IfLet(_, ref cond, ..) => (cond, "`if let` head expression", true),
@ -380,7 +383,7 @@ impl EarlyLintPass for UnusedParens {
return;
}
};
self.check_unused_parens_expr(cx, &value, msg, struct_lit_needs_parens);
self.check_unused_parens_expr(cx, &value, msg, followed_by_block);
}
fn check_pat(&mut self, cx: &EarlyContext, p: &ast::Pat) {

6
src/test/ui/lint/no-unused-parens-return-block.rs Normal file
View File

@ -0,0 +1,6 @@
// run-pass
fn main() {
match (return) {} // ok
if (return) {} // ok
}