On Fri, May 15, 2015 at 7:59 AM, Jonathan S. Shapiro <[email protected]> wrote: > So I have a "how do I use this idiomatically" sort of question... > > In ML/Haskell and friends, there is no syntactically simple way to say "all > legs of this union have the following fields in common". You either build a > structure with the common fields and mention it explicitly in every leg of > the union, or (conversely) you make the union an element of a larger > structure. > > AST nodes are a use case. They tend to have a large number of common > metadata fields (position, type, auxiliary marker bits of various sorts...) > and a small variant part describing the children of the node. > > Is there a common idiom that people use in cases like this?
in ML i've always used the latter, where the common elements and the union are elements of a larger structure _______________________________________________ bitc-dev mailing list [email protected] http://www.coyotos.org/mailman/listinfo/bitc-dev
