Index: compiler/org/eclipse/jdt/core/compiler/IProblem.java
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/core/compiler/IProblem.java,v
retrieving revision 1.107
diff -u -r1.107 IProblem.java
--- compiler/org/eclipse/jdt/core/compiler/IProblem.java	21 Oct 2004 21:31:23 -0000	1.107
+++ compiler/org/eclipse/jdt/core/compiler/IProblem.java	27 Oct 2004 20:42:13 -0000
@@ -1002,6 +1002,8 @@
 	int IllegalModifierForMemberEnum = TypeRelated + 753;
 	/** @since 3.1 */
 	int CannotDeclareEnumSpecialMethod = MethodRelated + 754;
+	/** @since 3.1 */
+	int CannotUseQualifiedEnumConstantInCaseLabe = FieldRelated + 755;
 
 	/**
 	 * Var args
Index: compiler/org/eclipse/jdt/internal/compiler/ast/CaseStatement.java
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/ast/CaseStatement.java,v
retrieving revision 1.9
diff -u -r1.9 CaseStatement.java
--- compiler/org/eclipse/jdt/internal/compiler/ast/CaseStatement.java	21 Oct 2004 13:34:43 -0000	1.9
+++ compiler/org/eclipse/jdt/internal/compiler/ast/CaseStatement.java	27 Oct 2004 20:42:13 -0000
@@ -105,6 +105,9 @@
 				this.isEnumConstant = true;
 				if (constantExpression instanceof NameReference
 						&& (constantExpression.bits & RestrictiveFlagMASK) == Binding.FIELD) {
+					if (constantExpression instanceof QualifiedNameReference) {
+						 scope.problemReporter().cannotUseQualifiedEnumConstantInCaseLabel(constantExpression);
+					}
 					return Constant.fromValue(((NameReference)constantExpression).fieldBinding().id); // ordinal value
 				}
 			} else {
Index: compiler/org/eclipse/jdt/internal/compiler/problem/ProblemReporter.java
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/problem/ProblemReporter.java,v
retrieving revision 1.185
diff -u -r1.185 ProblemReporter.java
--- compiler/org/eclipse/jdt/internal/compiler/problem/ProblemReporter.java	25 Oct 2004 15:53:55 -0000	1.185
+++ compiler/org/eclipse/jdt/internal/compiler/problem/ProblemReporter.java	27 Oct 2004 20:42:14 -0000
@@ -353,6 +353,14 @@
 		reference.sourceStart,
 		reference.sourceEnd);
 }
+public void cannotUseQualifiedEnumConstantInCaseLabel(Expression expression) {
+	this.handle(
+			IProblem.CannotUseQualifiedEnumConstantInCaseLabe,
+			NoArgument,
+			NoArgument,
+			expression.sourceStart,
+			expression.sourceEnd);	
+}
 public void caseExpressionMustBeConstant(Expression expression) {
 	this.handle(
 		IProblem.NonConstantExpression,
Index: compiler/org/eclipse/jdt/internal/compiler/problem/messages.properties
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/problem/messages.properties,v
retrieving revision 1.130
diff -u -r1.130 messages.properties
--- compiler/org/eclipse/jdt/internal/compiler/problem/messages.properties	25 Oct 2004 15:53:55 -0000	1.130
+++ compiler/org/eclipse/jdt/internal/compiler/problem/messages.properties	27 Oct 2004 20:42:14 -0000
@@ -474,7 +474,7 @@
 752 = Illegal modifier for the local enum {0}; only one of abstract or final is permitted
 753 = Illegal modifier for the member enum {0}; only public, protected, private, static, abstract & final are permitted
 754 = The enum {1} already defines the method {0}({2}) implicitly
-
+755 = An case label must not be the qualified name of an enumeration constant
 ### VARARGS
 800 = Extended dimensions are illegal for a variable argument
 801 = Varargs argument {0} should be cast to {1} when passed to the method {2}({3}) from type {4}