FULL PRODUCT VERSION :
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode)

java version "1.5.0_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_01-b08)
Java HotSpot(TM) Client VM (build 1.5.0_01-b08, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]
(Japanese)

A DESCRIPTION OF THE PROBLEM :
The following Test.java is warned but it should not be warned.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
>javac -J-Duser.language=en -version -Xlint:unchecked Test.java
javac 1.5.0_01
Test.java:8: warning: [unchecked] unchecked cast
found   : java.util.List<capture of ? extends java.lang.String>
required: StringList
        java.util.List<String> b = (StringList) a;      // warned but safe.
                                                ^
1 warning

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Test.java can be compiled without warnings.
ACTUAL -
A [unchecked] warning.
(See "Steps to Reproduce")

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
--------Test.java--------
class StringList extends java.util.LinkedList<String> {
}

public class Test {
    public static void main(String[] args) {
        java.util.List<? extends String> a = new StringList();
        java.util.List<String> b = (StringList) a;      // warned but safe.
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Use StringList.class.cast(a)
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