Nikita Popov a6d2cd69f8 Clarify attribute assignment code
* Don't assign to attribute stack on reduce - why was that there
in the first place?
* Assign attributes to the position in the stack where the first
token of the production is, instead of one position earlier.
* Add a comment to clarify why we also assign attributes on read,
instead of just on shift.
2015-04-26 11:56:01 +02:00
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