feat: Expr-level shape type definition #58
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…ctive type and pfunctor defs of a shape type
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This PR defines a
ShapeTypestructure, which captures the notion of a shape type (i.e., a type where all constructor arguments are plain type parameters), and has methods to automatically define the corresponding inductive type and polynomial functors --- without having to mangle syntax.This is not yet used in the (co)data macro implementations, because automatically deriving equivalences is still WIP.