Use PutBackN instead of PutBack in parser #364
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The parser could be confused into dropping tokens by calling `PutBack::put_back` twice in a row. This commit switches to `PutBackN`, which doesn't have that behavior.
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The parser could be confused into dropping tokens by calling
PutBack::put_backtwice in a row. This commit switches toPutBackN, which doesn't have that behavior. This fixes #363.Thanks @RadicalZephyr for adding the fuzz testing that found this!