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The Scala classfile and java source parsers make Java annotation
classes (which are actually interfaces at the classfile level) look
like Scala annotation classes:
- the INTERFACE / ABSTRACT flags are not added
- scala.annotation.Annotation is added as superclass
- scala.annotation.ClassfileAnnotation is added as interface
This makes type-checking @Annot uniform, whether it is defined in Java
or Scala.
This is a hack that leads to various bugs (SI-9393, SI-9400). Instead
the type-checking should be special-cased for Java annotations.
This commit fixes SI-9393 and a part of SI-9400, but it's still easy
to generate invalid classfiles. Restores the assertions that were
disabled in #4621. I'd like to leave these assertions in: they
are valuable and helped uncovering the issue being fixed here.
A new flag JAVA_ANNOTATION is introduced for Java annotation
ClassSymbols, similar to the existing ENUM flag. When building
ClassBTypes for Java annotations, the flags, superclass and interfaces
are recovered to represent the situation in the classfile.
Cleans up and documents the flags space in the area of "late" and
"anti" flags.
The test for SI-9393 is extended to test both the classfile and the
java source parser.
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