An AssertionError occurs while compiling the following code using "javac -target 1.5 Main.java":
--------------------------------------------------------------------------
import java.util.List;

public class Main {

    public static void main(String[] args) {
        try {
        } finally {
            List<List<?>> l = null;
            for (List<?> textRegion : l) {
            }
        }
    }

}
--------------------------------------------------------------------------

Please note that "-target 1.5" is required on JDK6 and JDK7, can be omitted on JDK5.

I can reproduce on:
$ java -version
java version "1.5.0_12"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04)
Java HotSpot(TM) Server VM (build 1.5.0_12-b04, mixed mode)

$ java -version
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b22)
Java HotSpot(TM) Server VM (build 11.0-b08, mixed mode)

$ java -version
java version "1.6.0_10-ea"
Java(TM) SE Runtime Environment (build 1.6.0_10-ea-b12)
Java HotSpot(TM) Server VM (build 11.0-b11, mixed mode)

Stack trace (from 1.7.0-ea-b22):
An exception has occurred in the compiler (1.7.0-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.AssertionError: com.sun.tools.javac.jvm.Gen$1ComplexityScanner
        at com.sun.tools.javac.jvm.Gen$1ComplexityScanner.visitWildcard(Gen.java:1587)
        at com.sun.tools.javac.tree.JCTree$JCWildcard.accept(JCTree.java:1896)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.jvm.Gen$1ComplexityScanner.scan(Gen.java:1517)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
        at com.sun.tools.javac.tree.TreeScanner.visitTypeApply(TreeScanner.java:268)
        at com.sun.tools.javac.tree.JCTree$JCTypeApply.accept(JCTree.java:1840)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.jvm.Gen$1ComplexityScanner.scan(Gen.java:1517)
        at com.sun.tools.javac.tree.TreeScanner.visitVarDef(TreeScanner.java:94)
        at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:709)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.jvm.Gen$1ComplexityScanner.scan(Gen.java:1517)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
        at com.sun.tools.javac.tree.TreeScanner.visitBlock(TreeScanner.java:102)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:765)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.jvm.Gen$1ComplexityScanner.scan(Gen.java:1517)
        at com.sun.tools.javac.tree.TreeScanner.visitForLoop(TreeScanner.java:119)
        at com.sun.tools.javac.jvm.Gen$1ComplexityScanner.visitForLoop(Gen.java:1525)
        at com.sun.tools.javac.tree.JCTree$JCForLoop.accept(JCTree.java:856)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.jvm.Gen$1ComplexityScanner.scan(Gen.java:1517)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
        at com.sun.tools.javac.tree.TreeScanner.visitBlock(TreeScanner.java:102)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:765)
        at com.sun.tools.javac.jvm.Gen.estimateCodeComplexity(Gen.java:1591)
        at com.sun.tools.javac.jvm.Gen.visitTry(Gen.java:1311)
        at com.sun.tools.javac.tree.JCTree$JCTry.accept(JCTree.java:1023)
        at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:679)
        at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:714)
        at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
        at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:751)
        at com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1027)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:765)
        at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:679)
        at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:714)
        at com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:907)
        at com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:880)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:653)
        at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:679)
        at com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2219)
        at com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:631)
        at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1303)
        at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1273)
        at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:779)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:744)
        at com.sun.tools.javac.main.Main.compile(Main.java:386)
        at com.sun.tools.javac.main.Main.compile(Main.java:312)
        at com.sun.tools.javac.main.Main.compile(Main.java:303)
        at com.sun.tools.javac.Main.compile(Main.java:82)
        at com.sun.tools.javac.Main.main(Main.java:67)