ComparisonOrShiftInterpretedAsGenericSugg, DoCatchSyntaxRemoved, DotDotDot, EqFieldInit,
ExpectedElseBlock, ExpectedEqForLetExpr, ExpectedExpressionFoundLet,
FieldExpressionWithGeneric, FloatLiteralRequiresIntegerPart, FoundExprWouldBeStmt,
- IfExpressionMissingCondition, IfExpressionMissingThenBlock, IfExpressionMissingThenBlockSub,
- InvalidBlockMacroSegment, InvalidComparisonOperator, InvalidComparisonOperatorSub,
- InvalidInterpolatedExpression, InvalidLiteralSuffixOnTupleIndex, InvalidLogicalOperator,
- InvalidLogicalOperatorSub, LabeledLoopInBreak, LeadingPlusNotSupported, LeftArrowOperator,
- LifetimeInBorrowExpression, MacroInvocationWithQualifiedPath, MalformedLoopLabel,
- MatchArmBodyWithoutBraces, MatchArmBodyWithoutBracesSugg, MissingCommaAfterMatchArm,
- MissingDotDot, MissingInInForLoop, MissingInInForLoopSub, MissingSemicolonBeforeArray,
- NoFieldsForFnCall, NotAsNegationOperator, NotAsNegationOperatorSub,
- OuterAttributeNotAllowedOnIfElse, ParenthesesWithStructFields,
+ IfExpressionLetSomeSub, IfExpressionMissingCondition, IfExpressionMissingThenBlock,
+ IfExpressionMissingThenBlockSub, InvalidBlockMacroSegment, InvalidComparisonOperator,
+ InvalidComparisonOperatorSub, InvalidInterpolatedExpression, InvalidLiteralSuffixOnTupleIndex,
+ InvalidLogicalOperator, InvalidLogicalOperatorSub, LabeledLoopInBreak, LeadingPlusNotSupported,
+ LeftArrowOperator, LifetimeInBorrowExpression, MacroInvocationWithQualifiedPath,
+ MalformedLoopLabel, MatchArmBodyWithoutBraces, MatchArmBodyWithoutBracesSugg,
+ MissingCommaAfterMatchArm, MissingDotDot, MissingInInForLoop, MissingInInForLoopSub,
+ MissingSemicolonBeforeArray, NoFieldsForFnCall, NotAsNegationOperator,
+ NotAsNegationOperatorSub, OuterAttributeNotAllowedOnIfElse, ParenthesesWithStructFields,
RequireColonAfterLabeledExpression, ShiftInterpretedAsGeneric, StructLiteralNotAllowedHere,
StructLiteralNotAllowedHereSugg, TildeAsUnaryOperator, UnexpectedIfWithIf,
UnexpectedTokenAfterLabel, UnexpectedTokenAfterLabelSugg, WrapExpressionInParentheses,
err.span_label(sp, "while parsing this `loop` expression");
err
})
- } else if self.eat_keyword(kw::Continue) {
- let kind = ExprKind::Continue(self.eat_label());
- Ok(self.mk_expr(lo.to(self.prev_token.span), kind))
} else if self.eat_keyword(kw::Match) {
let match_sp = self.prev_token.span;
self.parse_match_expr().map_err(|mut err| {
self.parse_try_block(lo)
} else if self.eat_keyword(kw::Return) {
self.parse_return_expr()
+ } else if self.eat_keyword(kw::Continue) {
+ self.parse_continue_expr(lo)
} else if self.eat_keyword(kw::Break) {
self.parse_break_expr()
} else if self.eat_keyword(kw::Yield) {
} else if self.eat(&token::Comma) {
// Vector with two or more elements.
let sep = SeqSep::trailing_allowed(token::Comma);
- let (remaining_exprs, _) = self.parse_seq_to_end(close, sep, |p| p.parse_expr())?;
- let mut exprs = vec![first_expr];
- exprs.extend(remaining_exprs);
+ let (mut exprs, _) = self.parse_seq_to_end(close, sep, |p| p.parse_expr())?;
+ exprs.insert(0, first_expr);
ExprKind::Array(exprs)
} else {
// Vector with one element
fn parse_break_expr(&mut self) -> PResult<'a, P<Expr>> {
let lo = self.prev_token.span;
let mut label = self.eat_label();
- let kind = if label.is_some() && self.token == token::Colon {
+ let kind = if self.token == token::Colon && let Some(label) = label.take() {
// The value expression can be a labeled loop, see issue #86948, e.g.:
// `loop { break 'label: loop { break 'label 42; }; }`
- let lexpr = self.parse_labeled_expr(label.take().unwrap(), true)?;
+ let lexpr = self.parse_labeled_expr(label, true)?;
self.sess.emit_err(LabeledLoopInBreak {
span: lexpr.span,
sub: WrapExpressionInParentheses {
} else if self.token != token::OpenDelim(Delimiter::Brace)
|| !self.restrictions.contains(Restrictions::NO_STRUCT_LITERAL)
{
- let expr = self.parse_expr_opt()?;
- if let Some(expr) = &expr {
+ let mut expr = self.parse_expr_opt()?;
+ if let Some(expr) = &mut expr {
if label.is_some()
&& matches!(
expr.kind,
BuiltinLintDiagnostics::BreakWithLabelAndLoop(expr.span),
);
}
+
+ // Recover `break label aaaaa`
+ if self.may_recover()
+ && let ExprKind::Path(None, p) = &expr.kind
+ && let [segment] = &*p.segments
+ && let &ast::PathSegment { ident, args: None, .. } = segment
+ && let Some(next) = self.parse_expr_opt()?
+ {
+ label = Some(self.recover_ident_into_label(ident));
+ *expr = next;
+ }
}
+
expr
} else {
None
self.maybe_recover_from_bad_qpath(expr)
}
+ /// Parse `"continue" label?`.
+ fn parse_continue_expr(&mut self, lo: Span) -> PResult<'a, P<Expr>> {
+ let mut label = self.eat_label();
+
+ // Recover `continue label` -> `continue 'label`
+ if self.may_recover()
+ && label.is_none()
+ && let Some((ident, _)) = self.token.ident()
+ {
+ self.bump();
+ label = Some(self.recover_ident_into_label(ident));
+ }
+
+ let kind = ExprKind::Continue(label);
+ Ok(self.mk_expr(lo.to(self.prev_token.span), kind))
+ }
+
/// Parse `"yield" expr?`.
fn parse_yield_expr(&mut self) -> PResult<'a, P<Expr>> {
let lo = self.prev_token.span;
if let token::Literal(token::Lit { kind: token::Integer, symbol, suffix }) =
next_token.kind
{
- if self.token.span.hi() == next_token.span.lo() {
+ // If this integer looks like a float, then recover as such.
+ //
+ // We will never encounter the exponent part of a floating
+ // point literal here, since there's no use of the exponent
+ // syntax that also constitutes a valid integer, so we need
+ // not check for that.
+ if suffix.map_or(true, |s| s == sym::f32 || s == sym::f64)
+ && symbol.as_str().chars().all(|c| c.is_numeric() || c == '_')
+ && self.token.span.hi() == next_token.span.lo()
+ {
let s = String::from("0.") + symbol.as_str();
let kind = TokenKind::lit(token::Float, Symbol::intern(&s), suffix);
return Some(Token::new(kind, self.token.span.to(next_token.span)));
if let ExprKind::Block(_, None) = right.kind => {
self.sess.emit_err(IfExpressionMissingThenBlock {
if_span: lo,
- sub: IfExpressionMissingThenBlockSub::UnfinishedCondition(
- cond_span.shrink_to_lo().to(*binop_span)
- ),
+ missing_then_block_sub:
+ IfExpressionMissingThenBlockSub::UnfinishedCondition(cond_span.shrink_to_lo().to(*binop_span)),
+ let_else_sub: None,
+
});
std::mem::replace(right, this.mk_expr_err(binop_span.shrink_to_hi()))
},
if let Some(block) = recover_block_from_condition(self) {
block
} else {
+ let let_else_sub = matches!(cond.kind, ExprKind::Let(..))
+ .then(|| IfExpressionLetSomeSub { if_span: lo });
+
self.sess.emit_err(IfExpressionMissingThenBlock {
if_span: lo,
- sub: IfExpressionMissingThenBlockSub::AddThenBlock(cond_span.shrink_to_hi()),
+ missing_then_block_sub: IfExpressionMissingThenBlockSub::AddThenBlock(
+ cond_span.shrink_to_hi(),
+ ),
+ let_else_sub,
});
self.mk_block_err(cond_span.shrink_to_hi())
}
false
}
+ /// Converts an ident into 'label and emits an "expected a label, found an identifier" error.
+ fn recover_ident_into_label(&mut self, ident: Ident) -> Label {
+ // Convert `label` -> `'label`,
+ // so that nameres doesn't complain about non-existing label
+ let label = format!("'{}", ident.name);
+ let ident = Ident { name: Symbol::intern(&label), span: ident.span };
+
+ self.struct_span_err(ident.span, "expected a label, found an identifier")
+ .span_suggestion(
+ ident.span,
+ "labels start with a tick",
+ label,
+ Applicability::MachineApplicable,
+ )
+ .emit();
+
+ Label { ident }
+ }
+
/// Parses `ident (COLON expr)?`.
fn parse_expr_field(&mut self) -> PResult<'a, ExprField> {
let attrs = self.parse_outer_attributes()?;
limits: RangeLimits,
) -> ExprKind {
if end.is_none() && limits == RangeLimits::Closed {
- self.inclusive_range_with_incorrect_end(self.prev_token.span);
+ self.inclusive_range_with_incorrect_end();
ExprKind::Err
} else {
ExprKind::Range(start, end, limits)
projects / rust.git / blobdiff