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? Jonathan
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