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syntax: use PatKind::Wild as our ::Err equivalent.

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This commit is contained in:
Mazdak Farrokhzad 2019-10-14 17:25:50 +02:00
parent a77a8aaa2e
commit 72ad8f716b
1 changed files with 10 additions and 10 deletions
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20
src/libsyntax/parse/parser/pat.rs
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@ -421,18 +421,18 @@ impl<'a> Parser<'a> {
.span_label(rhs.span, "binding on the right, should be to the left")
.span_suggestion(sp, "switch the order", pprust::pat_to_string(&rhs), applicability)
.emit();
rhs.span = sp;
return Ok(rhs);
} else {
// The special case above doesn't apply so we may have e.g. `A(x) @ B(y)`.
rhs.kind = PatKind::Wild;
self.struct_span_err(sp, "left-hand side of `@` must be a binding pattern")
.span_label(lhs.span, "interpreted as a pattern, not a binding")
.span_label(rhs.span, "also a pattern")
.note("bindings are `x`, `mut x`, `ref x`, and `ref mut x`")
.emit();
}
// The special case above doesn't apply so we may have e.g. `A(x) @ B(y)`.
let mut err = self.struct_span_err(sp, "left-hand side of `@` must be a binding pattern");
err.span_label(lhs.span, "interpreted as a pattern, not a binding")
.span_label(rhs.span, "also a pattern")
.note("bindings are `x`, `mut x`, `ref x`, and `ref mut x`");
// FIXME(Centril): Introduce `PatKind::Err` and use that instead.
Err(err)
rhs.span = sp;
Ok(rhs)
}
/// Ban a range pattern if it has an ambiguous interpretation.