8016640: compiler hangs if the generics arity of a base class is wrong Summary: Check.checkCompatibleConcretes hang when javac creates synthetic supertypes for 269 model API Reviewed-by: jjg

7041019: Bogus type-variable substitution with array types with dependencies on accessibility check Summary: call to upperBound() when performing type-variable substitution on element type leads to unsoundness Reviewed-by: jjg

8020286: Wrong diagnostic after compaction Summary: compact diagnostic shows the least relevant method in the list Reviewed-by: jjg