bjoernager/rust
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suggest parenthesis around ExprWithBlock BinOp ExprWithBlock

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This commit is contained in:
Lukas Markeffsky 2022-12-03 20:02:39 +01:00
parent 4bb15759d7
commit 35c00a9731
5 changed files with 71 additions and 14 deletions
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14
compiler/rustc_parse/src/parser/expr.rs
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@ -390,20 +390,10 @@ impl<'a> Parser<'a> {
// want to keep their span info to improve diagnostics in these cases in a later stage.
(true, Some(AssocOp::Multiply)) | // `{ 42 } *foo = bar;` or `{ 42 } * 3`
(true, Some(AssocOp::Subtract)) | // `{ 42 } -5`
(true, Some(AssocOp::Add)) // `{ 42 } + 42
// If the next token is a keyword, then the tokens above *are* unambiguously incorrect:
// `if x { a } else { b } && if y { c } else { d }`
if !self.look_ahead(1, |t| t.is_used_keyword()) => {
// These cases are ambiguous and can't be identified in the parser alone.
let sp = self.sess.source_map().start_point(self.token.span);
self.sess.ambiguous_block_expr_parse.borrow_mut().insert(sp, lhs.span);
false
}
(true, Some(AssocOp::LAnd)) |
(true, Some(AssocOp::Add)) | // `{ 42 } + 42
(true, Some(AssocOp::LAnd)) | // `{ 42 } &&x` (#61475) or `{ 42 } && if x { 1 } else { 0 }`
(true, Some(AssocOp::LOr)) |
(true, Some(AssocOp::BitOr)) => {
// `{ 42 } &&x` (#61475) or `{ 42 } && if x { 1 } else { 0 }`. Separated from the
// above due to #74233.
// These cases are ambiguous and can't be identified in the parser alone.
//
// Bitwise AND is left out because guessing intent is hard. We can make