Martijn van Oosterhout wrote:

Shift/reduce and reduce/reduce errors still produce valid working
parsers, it's just that bison has to resolve an ambiguity by the
default (shift, otherwise earliest rule wins. maximum munch rule

If you don't like relying on file order to resolve this, appropriate
use of %prec would have the same effect (just like for operator
precedence). The output file tell you which way bison went.

If we allow shift/reduce or reduce/reduce conflicts, debugging future development becomes more difficult. Right now we have the nice property that if you see one of those you know you've done something wrong (and using the expect directive isn't really a good answer, and only applies to shift/reduce conflicts anyway).



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