.java file can not define variable name which is the same to the innerclass name.

TEST PROGRAM:
---
class RegInnerClass
{
  static class X { }
  X X = new X();
}
---

REPRODUCE:
1. Compile the above test case
2. Run "javac class RegInnerClass"

C:\Users\licensees\javac-regression-5u25>javac -J-Duser.language=en RegInnerClass.java
RegInnerClass.java:4: RegInnerClass.X is already defined in RegInnerClass
  X X = new X();
    ^
1 error

NOTE:
This occurs in jdk5u25( and later jdk5ux), but not in JDK5u24(and former jdk5ux), jdk6ux, jdk7ux and jdk8b83.
This seems regression in jdk5u25.