Interpreter can't `upcast_distinct` from `UInt8*` to `Void*`

[ysbaddaden]

The interpreter fails to autocast a Pointer(UInt8) to Pointer(Void) while the compiler has no issues with it:

For example:

lib Foo
  struct S
    data : Pointer(Void)
  end
end

s = Foo::S.new
s.data = Pointer(UInt8).null

p s
# => Foo::S(@data=Pointer(Void).null)

 8 | s.data = Pointer(UInt8*).null
                              ^---
Error: BUG: missing upcast_distinct from Pointer(UInt8) to Pointer(Void)
(Crystal::PointerInstanceType to Crystal::PointerInstanceType)

---

Add a 👍 reaction to issues you find important.