This PR adds a feature where `structure` constructors can override the inferred binder kinds of the type's parameters. In the following, the `(p)` binder on `toLp` causes `p` to be an explicit parameter to `WithLp.toLp`: ```lean structure WithLp (p : Nat) (V : Type) where toLp (p) :: ofLp : V ``` This reflects the syntax of the feature added in #7742 for overriding binder kinds of structure projections. Similarly, only those parameters in the header of the `structure` may be updated; it is an error to try to update binder kinds of parameters included via `variable`. Closes #9072. Fixes a possible bug from stale caches when creating the type of the constructor. |
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