Build History for pull/2644

add a Pattern constructor to Extended_ast.t 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.

add a Pattern constructor to Extended_ast.t 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.