parser: recover on `&'lifetime mut $pat`.
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@ -459,18 +459,28 @@ impl<'a> Parser<'a> {
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/// Parse `&pat` / `&mut pat`.
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fn parse_pat_deref(&mut self, expected: Expected) -> PResult<'a, PatKind> {
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self.expect_and()?;
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self.recover_lifetime_in_deref_pat();
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let mutbl = self.parse_mutability();
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if let token::Lifetime(name) = self.token.kind {
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let mut err = self.fatal(&format!("unexpected lifetime `{}` in pattern", name));
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err.span_label(self.token.span, "unexpected lifetime");
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return Err(err);
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}
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let subpat = self.parse_pat_with_range_pat(false, expected)?;
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Ok(PatKind::Ref(subpat, mutbl))
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}
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fn recover_lifetime_in_deref_pat(&mut self) {
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if let token::Lifetime(name) = self.token.kind {
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self.bump(); // `'a`
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let span = self.prev_span;
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self.struct_span_err(span, &format!("unexpected lifetime `{}` in pattern", name))
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.span_suggestion(
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span,
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"remove the lifetime",
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String::new(),
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Applicability::MachineApplicable,
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)
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.emit();
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}
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}
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/// Parse a tuple or parenthesis pattern.
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fn parse_pat_tuple_or_parens(&mut self) -> PResult<'a, PatKind> {
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let (fields, trailing_comma) = self.parse_paren_comma_seq(|p| p.parse_pat_with_or_inner())?;
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@ -0,0 +1,6 @@
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fn main() {
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let &'a x = &0; //~ ERROR unexpected lifetime `'a` in pattern
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let &'a mut y = &mut 0; //~ ERROR unexpected lifetime `'a` in pattern
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let _recovery_witness: () = 0; //~ ERROR mismatched types
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}
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@ -0,0 +1,23 @@
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error: unexpected lifetime `'a` in pattern
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--> $DIR/lifetime-in-pattern-recover.rs:2:10
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LL | let &'a x = &0;
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| ^^ help: remove the lifetime
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error: unexpected lifetime `'a` in pattern
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--> $DIR/lifetime-in-pattern-recover.rs:3:10
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LL | let &'a mut y = &mut 0;
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| ^^ help: remove the lifetime
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error[E0308]: mismatched types
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--> $DIR/lifetime-in-pattern-recover.rs:5:33
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LL | let _recovery_witness: () = 0;
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| -- ^ expected `()`, found integer
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| |
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| expected due to this
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0308`.
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@ -1,5 +1,6 @@
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fn test(&'a str) {
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//~^ ERROR unexpected lifetime `'a` in pattern
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//~| ERROR expected one of `:`, `@`, or `|`, found `)`
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}
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fn main() {
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@ -2,7 +2,13 @@ error: unexpected lifetime `'a` in pattern
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--> $DIR/lifetime-in-pattern.rs:1:10
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LL | fn test(&'a str) {
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| ^^ unexpected lifetime
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| ^^ help: remove the lifetime
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error: aborting due to previous error
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error: expected one of `:`, `@`, or `|`, found `)`
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--> $DIR/lifetime-in-pattern.rs:1:16
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LL | fn test(&'a str) {
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| ^ expected one of `:`, `@`, or `|`
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error: aborting due to 2 previous errors
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@ -2,7 +2,7 @@ error: unexpected lifetime `'a` in pattern
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--> $DIR/self-vs-path-ambiguity.rs:9:11
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LL | fn i(&'a self::S: &S) {}
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| ^^ unexpected lifetime
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| ^^ help: remove the lifetime
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error: aborting due to previous error
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