This improves recovery when parsing conditional import expressions
by repositioning the synthetic closing ')' that was inserted by the
scanner in a less than optimal location.
This approach relies on the beforeSynthetic field being set correctly.
While the scanner still sets the 'next' and 'beforeSynthetic' fields
directly for efficiency, most other functions which update an existing
token stream have been revised to call 'setNext()' rather than setting
the 'next' field directly. This ensures that the 'beforeSynthetic' field
will be correctly updated.
Change-Id: Id631fd600c64d1feaf00593acb74a7070e354f07
Reviewed-on: https://dart-review.googlesource.com/52120
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
danrubel
10b441b16b