Nathan Shively-Sanders 76a2ae3d69
Only issue matching token errors on non-dupe locations (#43460)
* Only issue matching token errors on non-dupe locations

Intead of unconditionally retrieving the last error and attaching a
related span, `parseErrorAt` and friends now return the last error and
return `false` when there is none.

Also make one more place use parseExpectedMatchingBrackets that I missed
last time.

* Inline parseTokenForError, return undefined not false

* skip redundant undefined assignment

* address PR comments
2021-03-31 13:54:53 -07:00
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