crash returning this-referencing lambda from default method

Compile the following interface:

public interface Z1 {
    default Runnable getAction() {
        return () -> {
            System.out.println(this);
        };
    }
}

This results in the following exception being thrown:

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:557)
at com.sun.tools.javac.jvm.Items$SelfItem.load(Items.java:367)
at com.sun.tools.javac.jvm.Gen.genArgs(Gen.java:951)
at com.sun.tools.javac.jvm.Gen.visitApply(Gen.java:1827)
at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)
at com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:932)
at com.sun.tools.javac.jvm.Gen.visitExec(Gen.java:1764)
at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1290)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:722)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:757)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:743)
at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:794)
at com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1142)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:903)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:722)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:757)
at com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:1017)
at com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:980)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:772)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:722)
at com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2435)
at com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:744)
at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1544)
at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1508)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:900)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:859)
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:64)
at com.sun.tools.javac.Main.main(Main.java:50)

A slight variation, such as adding a random unrelated line, will change the behavior. For example,

public interface Z2 {
    default Runnable getAction() {
        return () -> {
            int x = 0; // a random line
            System.out.println(this); // prints "null"
};
    }

    public static void main(String[] args)
    {
      Z2 z2 = new Z2() { };
z2.getAction().run();
    }
}

The original reporter says that this prints "null" but this was with b105. When I tried this on b106, I get the exception below. This is probably a related bug.

Exception in thread "main" java.lang.VerifyError: Bad local variable type
Exception Details:
  Location:
    Z2.lambda$0()V @5: aload_0
  Reason:
    Type integer (current frame, locals[0]) is not assignable to reference type
  Current Frame:
    bci: @5
    flags: { }
    locals: { integer }
    stack: { 'java/io/PrintStream' }
  Bytecode:
    0000000: 033b b200 062a b600 07b1

at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2594)
at java.lang.Class.getMethod0(Class.java:2835)
at java.lang.Class.getMethod(Class.java:1711)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:531)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:513)

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Originally reported by Zhong Yu on lambda-dev:

http://mail.openjdk.java.net/pipermail/lambda-dev/2013-September/010926.html