Consider the following code:
---
public class Main<A, A, T> {
}
---

Compiling it with:
$ javac -fullversion
javac full version "1.8.0-b132"

Leads to:
An exception has occurred in the compiler (1.8.0). 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.NullPointerException
        at com.sun.tools.javac.comp.MemberEnter.baseEnv(MemberEnter.java:1385)
        at com.sun.tools.javac.comp.MemberEnter.complete(MemberEnter.java:1046)
        at com.sun.tools.javac.code.Symbol.complete(Symbol.java:560)
        at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1024)
        at com.sun.tools.javac.code.Symbol$ClassSymbol.flags(Symbol.java:960)
        at com.sun.tools.javac.code.Symbol$ClassSymbol.getKind(Symbol.java:1088)
        at com.sun.tools.javac.code.Kinds.kindName(Kinds.java:162)
        at com.sun.tools.javac.comp.Check.duplicateError(Check.java:327)
        at com.sun.tools.javac.comp.Check.checkUnique(Check.java:3370)
        at com.sun.tools.javac.comp.Enter.visitTypeParameter(Enter.java:458)
        at com.sun.tools.javac.tree.JCTree$JCTypeParameter.accept(JCTree.java:2218)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:262)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:276)
        at com.sun.tools.javac.comp.Enter.visitClassDef(Enter.java:422)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:687)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:262)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:276)
        at com.sun.tools.javac.comp.Enter.visitTopLevel(Enter.java:338)
        at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:518)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:262)
        at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:276)
        at com.sun.tools.javac.comp.Enter.complete(Enter.java:490)
        at com.sun.tools.javac.comp.Enter.main(Enter.java:475)
        at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:985)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)
        at com.sun.tools.javac.main.Main.compile(Main.java:523)
        at com.sun.tools.javac.main.Main.compile(Main.java:381)
        at com.sun.tools.javac.main.Main.compile(Main.java:370)
        at com.sun.tools.javac.main.Main.compile(Main.java:361)
        at com.sun.tools.javac.Main.compile(Main.java:56)
        at com.sun.tools.javac.Main.main(Main.java:42)