- Recover from struct parse error on match and point out missing match
body.
- Point at struct when finding non-identifier while parsing its fields.
- Add label to "expected identifier, found {}" error.
* Point at where the token was expected instead of the last token
successfuly parsed.
* Only show `unexpected token` if the next char and the unexpected token
don't have the same span.
* Change some cfail and pfail tests to ui test.
* Don't show all possible tokens in span label if they are more than 6.
