add a Pattern constructor to Extended_ast.t #2644
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So it's easier to print patterns, which seems like the main major syntactic category missing from the type. Granted, no standard source file contains a pattern, but the same argument applies to core_type.
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So it's easier to print patterns, which seems like the main major syntactic category missing from the sum type.
I think the only way to print pattern otherwise is to print a
fun $pat -> whatevernode and chop off the unwanted bits of the string.