Doug Gregor 4ddf6e565a Teach SuperclassDeclRequest to always diagnose circularity. ...

Rather than relying on clients to cope with the potential for circular
inheritance of superclass declarations, teach SuperclassDeclRequest to
establish whether circular inheritance has occurred and produce "null"
in such cases. This allows other clients to avoid having to think about

To benefit from this, have SuperclassTypeRequest evaluate
SuperclassDeclRequest first and, if null, produce a Type(). This
ensures that we don't get into an inconsistent situation where there
is a superclass type but no superclass declaration.

2020-09-29 17:42:17 -07:00

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