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Fix ICE on certain sequence repetitions.

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This commit is contained in:
Jeffrey Seyfried 2017-02-10 23:23:11 +00:00
parent f80514426a
commit b3d73995da
2 changed files with 29 additions and 5 deletions
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19
src/libsyntax/parse/parser.rs
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@ -302,11 +302,20 @@ impl<'a> Parser<'a> {
if i + 1 < tts.len() {
self.tts.push((tts, i + 1));
}
if let TokenTree::Token(sp, tok) = tt {
TokenAndSpan { tok: tok, sp: sp }
} else {
self.tts.push((tt, 0));
continue
// FIXME(jseyfried): remove after fixing #39390 in #39419.
if self.quote_depth > 0 {
if let TokenTree::Sequence(sp, _) = tt {
self.span_err(sp, "attempted to repeat an expression containing no \
syntax variables matched as repeating at this depth");
}
}
match tt {
TokenTree::Token(sp, tok) => TokenAndSpan { tok: tok, sp: sp },
_ if tt.len() > 0 => {
self.tts.push((tt, 0));
continue
}
_ => continue,
}
} else {
TokenAndSpan { tok: token::Eof, sp: self.span }