VerifyError with double Assignment using a Generic Member of a Superclass

FULL PRODUCT VERSION :
OS-X/Windows: javac 1.6.0_24
OS-X: openjdk-1.7-x86_64 javac 1.7.0-ea
Windows: javac 1.7.0-internal

ADDITIONAL OS VERSION INFORMATION :
Windows7-64 Bit
OS-X 10.6.7
probably any OS

A DESCRIPTION OF THE PROBLEM :
Given a Paramterized Subclass A<D> with a Member D d and a Method D getD(). A Subclass B extends A with a concrete Class (say Integer) and a Member y.

The double Assigmenet
 y = d = getD();
will result in a Byte code not accepted by the Verifier:
With JDK 1.6
java.lang.VerifyError: (class: test/problem/B, method: <init> signature: ()V)
Bad type in put field/putstatic

With JDK 1.7
java.lang.VerifyError: Bad type on operand stack in method test.problem.B.<init>()V at offset 14







STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute problem.sh:
#!/bin/bash
# problem
$JAVA_HOME/bin/javac -version
rm -Rf bin/*
$JAVA_HOME/bin/javac -Xlint:unchecked -g src/test/problem/*.java -d bin
$JAVA_HOME/bin/java -cp bin test.problem.B

OR problem.bat
%JAVA_HOME%\bin\javac -version
mkdir bin
del /S /Q bin\*
%JAVA_HOME%\bin\javac -Xlint:unchecked -g src/test/problem/*.java -d bin
%JAVA_HOME%\bin\java -cp bin test.problem.B

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No Exceptions
ACTUAL -
OS-X 10.6.7
./problem.sh
javac 1.6.0_24
Exception in thread "main" java.lang.VerifyError: (class: test/problem/B, method: <init> signature: ()V) Bad type in putfield/putstatic

$ export JAVA_HOME=/Library/Java/JavaVirtualMachines/openjdk-1.7-x86_64/Contents/Home
$ ./problem.sh javac 1.7.0-internal
Exception in thread "main" java.lang.VerifyError: Bad type on operand stack in method test.problem.B.<init>()V at offset 14
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
at java.lang.Class.getMethod0(Class.java:2685)
at java.lang.Class.getMethod(Class.java:1620)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:484)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:476)

problem
javac 1.6.0_24
Ein Unterverzeichnis oder eine Datei mit dem Namen "bin" existiert bereits.
Datei wurde gelöscht - D:\Develop\clean-code\Problem\bin\test\problem\A.class
Datei wurde gelöscht - D:\Develop\clean-code\Problem\bin\test\problem\B.class
Exception in thread "main" java.lang.VerifyError: (class: test/problem/B, method: <init> signature: ()V) Bad type in put
field/putstatic
Could not find the main class: test.problem.B. Program will exit.

Windows7 64-Bit
>problem
javac 1.7.0-ea
Exception in thread "main" java.lang.VerifyError: Bad type on operand stack in method test.problem.B.<init>()V at offset
14
       at java.lang.Class.getDeclaredMethods0(Native Method)
       at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
       at java.lang.Class.getMethod0(Class.java:2685)
       at java.lang.Class.getMethod(Class.java:1620)
       at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:484)
       at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:476)


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.VerifyError: (class: test/problem/B, method: <init> signature: ()V) Bad type in putfield/putstatic

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package test.problem;

class A<D> {

D d;

D getD() {
return null;
}
}

class B extends A<Integer> {

Integer y;

B() {
y = d = getD(); // Verify Error here
}

public static void main(String[] args) {
new B();
}
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Use single assignments.

It took me some 2 hours to boil down the Problem to this simple level.
One may get lost when it happens as part of some complex code.