Wrong scopes for `\data` defined with `\with` construction

[sxhya]

In the following example you will get multiple Cannot resolve reference 'X' errors, which can be fixed by replacing \with with \elim n:

\data Foo {X : \Type} (n : Nat) \with
  | zero => nil X
  | suc n => cons X (Foo {X} n)

[valis]

Not a bug