swift234

When creating a member reference, use a conversion constraint rather
than a subtyping constraint to relate the base type and the owner
type. This is required when the owner type is a protocol, because the
base type is something that conforms to that protocol (e.g., an
archetype), and this relationship is a conversion rather than a
subtype.

Note, however, that this does *not* allow arbitrary conversions to
occur for the purposes of member access, because name lookup for the
member will only find members when we're dealing with protocol
conformances or base classes.


Swift SVN r2916