bjoernager/rust
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fix #103587, Recover from common if let syntax mistakes/typos

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This commit is contained in:
yukang 2022-10-27 14:43:15 +08:00
parent 57d3c58ed6
commit 667b15bb0e
7 changed files with 165 additions and 4 deletions
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16
compiler/rustc_parse/src/parser/expr.rs
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@ -9,9 +9,9 @@ use crate::errors::{
ArrayBracketsInsteadOfSpaces, ArrayBracketsInsteadOfSpacesSugg, AsyncMoveOrderIncorrect,
BinaryFloatLiteralNotSupported, BracesForStructLiteral, CatchAfterTry, CommaAfterBaseStruct,
ComparisonInterpretedAsGeneric, ComparisonOrShiftInterpretedAsGenericSugg,
DoCatchSyntaxRemoved, DotDotDot, EqFieldInit, ExpectedElseBlock, ExpectedExpressionFoundLet,
FieldExpressionWithGeneric, FloatLiteralRequiresIntegerPart, FoundExprWouldBeStmt,
HexadecimalFloatLiteralNotSupported, IfExpressionMissingCondition,
DoCatchSyntaxRemoved, DotDotDot, EqFieldInit, ExpectedElseBlock, ExpectedEqForLetExpr,
ExpectedExpressionFoundLet, FieldExpressionWithGeneric, FloatLiteralRequiresIntegerPart,
FoundExprWouldBeStmt, HexadecimalFloatLiteralNotSupported, IfExpressionMissingCondition,
IfExpressionMissingThenBlock, IfExpressionMissingThenBlockSub, IntLiteralTooLarge,
InvalidBlockMacroSegment, InvalidComparisonOperator, InvalidComparisonOperatorSub,
InvalidFloatLiteralSuffix, InvalidFloatLiteralWidth, InvalidIntLiteralWidth,
@ -2334,7 +2334,15 @@ impl<'a> Parser<'a> {
RecoverColon::Yes,
CommaRecoveryMode::LikelyTuple,
)?;
self.expect(&token::Eq)?;
if self.token == token::EqEq {
self.sess.emit_err(ExpectedEqForLetExpr {
span: self.token.span,
sugg_span: self.token.span,
});
self.bump();
} else {
self.expect(&token::Eq)?;
}
let expr = self.with_res(self.restrictions | Restrictions::NO_STRUCT_LITERAL, |this| {
this.parse_assoc_expr_with(1 + prec_let_scrutinee_needs_par(), None.into())
})?;