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implement and use diagnostic_snapshot
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@ -179,6 +179,13 @@ impl<'a> Parser<'a> {
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&self.sess.span_diagnostic
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}
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pub(super) fn diagnostic_snapshot(&self) -> Self {
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let mut snapshot = self.clone();
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// initialize unclosed_delims to avoid duplicate errors.
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snapshot.unclosed_delims = vec![];
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snapshot
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}
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pub(super) fn span_to_snippet(&self, span: Span) -> Result<String, SpanSnippetError> {
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self.sess.source_map().span_to_snippet(span)
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}
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@ -625,8 +625,7 @@ impl<'a> Parser<'a> {
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} else if self.check_type() {
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// Parse type argument.
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let is_const_fn = self.look_ahead(1, |t| t.kind == token::OpenDelim(token::Paren));
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let mut snapshot = self.clone();
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snapshot.unclosed_delims = vec![];
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let mut snapshot = self.diagnostic_snapshot();
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match self.parse_ty() {
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Ok(ty) => GenericArg::Type(ty),
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Err(err) => {
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