Java 8 lulz

Bug.java

import java.util.function.Function;

public interface Bug {
  static void bug() {
    bug(a -> a);
  }
  static void bug(Function<?, ?> f) {}
}

npe.txt

jdk8 > javac Bug.java
An exception has occurred in the compiler (1.8.0-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.NullPointerException
	at com.sun.tools.javac.jvm.Code.emitop0(Code.java:546)
	at com.sun.tools.javac.jvm.Items$SelfItem.load(Items.java:367)
	at com.sun.tools.javac.jvm.Gen.genArgs(Gen.java:913)
	at com.sun.tools.javac.jvm.Gen.visitApply(Gen.java:1752)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1440)
	at com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:894)
	at com.sun.tools.javac.jvm.Gen.genArgs(Gen.java:913)
	at com.sun.tools.javac.jvm.Gen.visitApply(Gen.java:1752)
	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1440)
	at com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:894)
	at com.sun.tools.javac.jvm.Gen.visitExec(Gen.java:1698)
	at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1271)
	at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:684)
	at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:719)
	at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:705)
	at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:756)
	at com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1094)
	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:884)
	at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:684)
	at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:719)
	at com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:969)
	at com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:942)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:771)
	at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:684)
	at com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2359)
	at com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:753)
	at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1547)
	at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1511)
	at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:909)
	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:868)
	at com.sun.tools.javac.main.Main.compile(Main.java:516)
	at com.sun.tools.javac.main.Main.compile(Main.java:376)
	at com.sun.tools.javac.main.Main.compile(Main.java:365)
	at com.sun.tools.javac.main.Main.compile(Main.java:356)
	at com.sun.tools.javac.Main.compile(Main.java:76)
	at com.sun.tools.javac.Main.main(Main.java:61)