Florian G. Pflug wrote:

bison -y -d  gram.y
conflicts: 2 shift/reduce

I'ts been quite a time since I last used bison, but as far as I
remember, you can tell it to write a rather details log about
it's analysis of the grammar. That log should include more
detailed information about those conflicts - maybe that helps
to figure out their exact cause, and to find a workaround.

You can almost always get rid of shift/reduce conflicts by unwinding some of the productions - resist the temptation to factor the grammar. The effect of this is to eliminate places where the parser has to decide between shifting and reducing. (This is why, for example, almost all the "drop foo if exists" variants require separate productions rather than using opt_if_exists.)



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