How to change default outcome of shift/reduce conflict?

[Anthony DeRobertis]

I'm doing a grammar for HyperTalk in bison, which has a command that looks 
takes a list of expressions, seperated by "or". An expression, however, can 
contain "or" (it's an operator). The language isn't spec'd by me, so I don't 
have the liberty of changing it. 

Other than writing an expression-without-or copy of expression, which I 
assume would work [haven't tried it yet], is there a way to tell bison to 
reduce, not shift? Expression is rather large, so I'd prefer not to 
duplicate it. 

[cc'd to the project mailing list]

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