Add rule to make it an error for a mixin on type to be super-bounded
#3535
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See #3491 where this change was discussed.
This PR makes it a compile-time error for a mixin
ontype to be super-bounded. This rule is similar to several other cases (it is an error for a type in anextends,implements, orwithclause to be super-bounded as well). For mixins it is justified by the fact that it is impossible to use a mixin with a super-boundedontype.There is no implementation effort because this is already the implemented behavior.