delete InternalError::Unknown - #227
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Previously, `last_err` returned `Unknown` if no tokens had been read. Contrary to the comments there, it is actually possible to hit this case in situations like `Named()` or an empty declarative macro substitution. Change things so that every `TokenDe` now carries the enclosing group. This lets us remove the `Unknown` variant and fix a couple of panics.
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Previously,
last_errreturnedUnknownif no tokens had been read. Contrary to the comments there, it is actually possible to hit this case in situations likeNamed()or an empty declarative macro substitution.Change things so that every
TokenDenow carries the enclosing group. This lets us remove theUnknownvariant and fix a couple of panics.