Re: shift/reduce conflict with unary

[Evan Lavelle]

You don't give enough information. Here's a couple of things to try:

1 - your grammar already has the precedence rules encoded in its 
structure. It's obvious, for example, that unary expressions have higher 
precedence than summation expressions. You only use the explicit '%prec' 
precedence when  there *isn't* an obvious precedence in your grammar; 
you shouldn't have both. Take out the %prec/%lefts, see what happens. 
The portion of grammar that you give looks Ok without these extras, but 
something else might give a conflict.

2 - Take out the "| PLUS NUMBER" rule. Do you still have a problem?

3 - You don't say what the conflict actually is; you'll need to try to 
read the output report. Find the section that reports on the potential 
shift and the potential reduction, and tell us about that bit.

Evan