catch uses eq? to match the tag to the error type -- I can't find any mention of this in s7.html -- will make it explicit. The expected usage for the (or 'a 'b) case would be to have two catches. Kinda ugly, now that I think about it. I borrowed catch from Guile, and now I don't remember if they accepted expressions for the tag. I don't like the r7rs "guard" or whatever they call it -- hmmm.
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