Description:
Compiler crashes with an Assertion error for the following code:
<code>
class TestClass {

    public static void main(String... args) {
        MyClass<? extends MyClass<?, ?>, ? extends MyClass<?, ?>> gg = null;
    }
}
class MyClass<T extends S, S> {
}
</code>
Compilation result is :
<output>

Following is the Error message:
An exception has occurred in the compiler (1.7.0-ea). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.AssertionError: isSubtype 15
        at com.sun.tools.javac.code.Types$5.visitType(Types.java:361)
        at com.sun.tools.javac.code.Types$5.visitType(Types.java:342)
        at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visitWildcardType(Types.java:3185)
        at com.sun.tools.javac.code.Type$WildcardType.accept(Type.java:430)
        at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:3183)
        at com.sun.tools.javac.code.Types.isSubtype(Types.java:338)
        at com.sun.tools.javac.code.Types.isSubtypeNoCapture(Types.java:325)
        at com.sun.tools.javac.code.Types$8.visitWildcardType(Types.java:812)
        at com.sun.tools.javac.code.Types$8.visitWildcardType(Types.java:761)
        at com.sun.tools.javac.code.Type$WildcardType.accept(Type.java:430)
        at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:3183)
        at com.sun.tools.javac.code.Types.containsType(Types.java:758)
        at com.sun.tools.javac.code.Types.containsType(Types.java:725)
        at com.sun.tools.javac.code.Types.giveWarning(Types.java:2923)
        at com.sun.tools.javac.code.Types.access$300(Types.java:66)
        at com.sun.tools.javac.code.Types$9.visitClassType(Types.java:983)
        at com.sun.tools.javac.code.Types$9.visitClassType(Types.java:885)
        at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:568)
        at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:3183)
        at com.sun.tools.javac.code.Types.isCastable(Types.java:876)
        at com.sun.tools.javac.comp.Check.checkExtends(Check.java:433)
        at com.sun.tools.javac.comp.Check.access$100(Check.java:55)
        at com.sun.tools.javac.comp.Check$Validator.visitTypeApply(Check.java:810)
        at com.sun.tools.javac.tree.JCTree$JCTypeApply.accept(JCTree.java:1840)
        at com.sun.tools.javac.comp.Check.validate(Check.java:745)
        at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:705)
        at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:709)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:372)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:409)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:425)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:761)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:765)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:372)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:409)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:680)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:653)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:372)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:409)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2740)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2666)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2602)
        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1050)
        at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:779)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:744)
        at com.sun.tools.javac.main.Main.compile(Main.java:386)
        at com.sun.tools.javac.main.Main.compile(Main.java:312)
        at com.sun.tools.javac.main.Main.compile(Main.java:303)
        at com.sun.tools.javac.Main.compile(Main.java:82)
        at com.sun.tools.javac.Main.main(Main.java:67)

</output>
<version>
/net/sqindia/export/disk09/jdk/7/latest/binaries/solsparc/bin/java -version
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b24)
Java HotSpot(TM) Client VM (build 12.0-b01, mixed mode)

uname -a
SunOS bonsai 5.11 snv_49 i86pc i386 i86pc
*** (#1 of 1): 2007-10-01 15:42:18 GMT+05:30 ###@###.###