### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: compiler/org/eclipse/jdt/internal/compiler/ast/EqualExpression.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/ast/EqualExpression.java,v
retrieving revision 1.77
diff -u -r1.77 EqualExpression.java
--- compiler/org/eclipse/jdt/internal/compiler/ast/EqualExpression.java	21 Jan 2010 16:48:36 -0000	1.77
+++ compiler/org/eclipse/jdt/internal/compiler/ast/EqualExpression.java	9 Feb 2010 13:07:44 -0000
@@ -862,7 +862,9 @@
 			// check whether comparing identical expressions
 			Binding leftDirect = Expression.getDirectBinding(this.left);
 			if (leftDirect != null && leftDirect == Expression.getDirectBinding(this.right)) {
-				if (!(this.right instanceof Assignment)) {
+				int leftTypeID = leftType.id;
+				if (leftTypeID != TypeIds.T_JavaLangFloat && leftTypeID != TypeIds.T_JavaLangDouble  &&  // https://bugs.eclipse.org/bugs/show_bug.cgi?id=301405
+						(!(this.right instanceof Assignment))) {
 					scope.problemReporter().comparingIdenticalExpressions(this);
 				}
 			}
#P org.eclipse.jdt.core.tests.compiler
Index: src/org/eclipse/jdt/core/tests/compiler/regression/AssignmentTest.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/AssignmentTest.java,v
retrieving revision 1.65
diff -u -r1.65 AssignmentTest.java
--- src/org/eclipse/jdt/core/tests/compiler/regression/AssignmentTest.java	21 Jan 2010 16:48:42 -0000	1.65
+++ src/org/eclipse/jdt/core/tests/compiler/regression/AssignmentTest.java	9 Feb 2010 13:08:13 -0000
@@ -1928,6 +1928,34 @@
 		options
 	);
 }
+// https://bugs.eclipse.org/bugs/show_bug.cgi?id=301405
+public void test068() {
+	Map options = getCompilerOptions();
+	options.put(CompilerOptions.OPTION_ReportComparingIdentical, CompilerOptions.ERROR);
+	this.runNegativeTest(
+		new String[] {
+			"X.java",
+			"public class X {\n" +
+			"	public boolean test(Float f) {\n" +
+			"       return f != f;\n" + 
+			"	}\n" +
+			"	public boolean test(Double f) {\n" +
+			"       return f != f;\n" + 
+			"	}\n" +
+			"   Zork z;\n" +
+			"}"
+		},
+		"----------\n" + 
+		"1. ERROR in X.java (at line 8)\n" + 
+		"	Zork z;\n" + 
+		"	^^^^\n" + 
+		"Zork cannot be resolved to a type\n" + 
+		"----------\n",
+		null,
+		true,
+		options
+	);
+}
 public static Class testClass() {
 	return AssignmentTest.class;
 }