### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: compiler/org/eclipse/jdt/internal/compiler/lookup/MethodVerifier15.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/lookup/MethodVerifier15.java,v
retrieving revision 1.62
diff -u -r1.62 MethodVerifier15.java
--- compiler/org/eclipse/jdt/internal/compiler/lookup/MethodVerifier15.java	12 Oct 2006 17:57:21 -0000	1.62
+++ compiler/org/eclipse/jdt/internal/compiler/lookup/MethodVerifier15.java	7 Nov 2006 12:39:15 -0000
@@ -528,7 +528,8 @@
 
 	inheritedMethod = computeSubstituteMethod(inheritedMethod, existingMethod);
 	return inheritedMethod != null
-		&& inheritedMethod.returnType == existingMethod.returnType
+		&& (inheritedMethod.returnType == existingMethod.returnType ||
+				inheritedMethod.returnType.isCompatibleWith(inheritedMethod.returnType))
 		&& super.isInterfaceMethodImplemented(inheritedMethod, existingMethod, superType);
 }
 SimpleSet findSuperinterfaceCollisions(ReferenceBinding superclass, ReferenceBinding[] superInterfaces) {
#P org.eclipse.jdt.core.tests.compiler
Index: src/org/eclipse/jdt/core/tests/compiler/regression/MethodVerifyTest.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/MethodVerifyTest.java,v
retrieving revision 1.104
diff -u -r1.104 MethodVerifyTest.java
--- src/org/eclipse/jdt/core/tests/compiler/regression/MethodVerifyTest.java	25 Oct 2006 14:18:03 -0000	1.104
+++ src/org/eclipse/jdt/core/tests/compiler/regression/MethodVerifyTest.java	7 Nov 2006 12:40:59 -0000
@@ -708,12 +708,7 @@
 				"abstract class X2 extends A implements J {}\n"
 			},
 			"----------\n" + 
-			"1. ERROR in A.java (at line 1)\r\n" + 
-			"	abstract class A implements I {}\r\n" + 
-			"	               ^\n" + 
-			"The return type is incompatible with J.foo(), I.foo()\n" + 
-			"----------\n" + 
-			"2. ERROR in A.java (at line 2)\r\n" + 
+			"1. ERROR in A.java (at line 2)\r\n" + 
 			"	interface I extends J { Object foo(); }\r\n" + 
 			"	                               ^^^^^\n" + 
 			"The return type is incompatible with J.foo()\n" + 
Index: src/org/eclipse/jdt/core/tests/compiler/regression/GenericTypeTest.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/GenericTypeTest.java,v
retrieving revision 1.554
diff -u -r1.554 GenericTypeTest.java
--- src/org/eclipse/jdt/core/tests/compiler/regression/GenericTypeTest.java	7 Nov 2006 09:37:30 -0000	1.554
+++ src/org/eclipse/jdt/core/tests/compiler/regression/GenericTypeTest.java	7 Nov 2006 12:40:41 -0000
@@ -31247,28 +31247,18 @@
 public void test0987() {
 	String expectedOutput = new CompilerOptions(getCompilerOptions()).sourceLevel < ClassFileConstants.JDK1_6
 	?	"----------\n" + 
-		"1. ERROR in X.java (at line 7)\n" + 
-		"	abstract class GLinkElementView<M,CM> extends AbstractLinkView<M> {}\n" + 
-		"	               ^^^^^^^^^^^^^^^^\n" + 
-		"The return type is incompatible with EditPart.getViewer(), AbstractLinkView<M>.getViewer()\n" + 
-		"----------\n" + 
-		"2. ERROR in X.java (at line 11)\n" + 
+		"1. ERROR in X.java (at line 11)\n" + 
 		"	public ISheetViewer getViewer() { return null; }	\n" + 
 		"	                    ^^^^^^^^^^^\n" + 
 		"The return type is incompatible with EditPart.getViewer()\n" + 
 		"----------\n" + 
-		"3. ERROR in X.java (at line 11)\n" + 
+		"2. ERROR in X.java (at line 11)\n" + 
 		"	public ISheetViewer getViewer() { return null; }	\n" + 
 		"	                    ^^^^^^^^^^^\n" + 
 		"The method getViewer() of type AbstractLinkView<M> must override a superclass method\n" + 
 		"----------\n"
 	:	"----------\n" + 
-		"1. ERROR in X.java (at line 7)\n" + 
-		"	abstract class GLinkElementView<M,CM> extends AbstractLinkView<M> {}\n" + 
-		"	               ^^^^^^^^^^^^^^^^\n" + 
-		"The return type is incompatible with EditPart.getViewer(), AbstractLinkView<M>.getViewer()\n" + 
-		"----------\n" + 
-		"2. ERROR in X.java (at line 11)\n" + 
+		"1. ERROR in X.java (at line 11)\n" + 
 		"	public ISheetViewer getViewer() { return null; }	\n" + 
 		"	                    ^^^^^^^^^^^\n" + 
 		"The return type is incompatible with EditPart.getViewer()\n" + 
@@ -31360,7 +31350,7 @@
 			"1. ERROR in X.java (at line 7)\n" + 
 			"	abstract class GLinkElementView<M,CM> extends AbstractLinkView<M> {}\n" + 
 			"	               ^^^^^^^^^^^^^^^^\n" + 
-			"The return type is incompatible with ILinkViewElement.getViewer(), AbstractEditPart.getViewer(), AbstractLinkView<M>.getViewer()\n" + 
+			"The return type is incompatible with AbstractEditPart.getViewer(), AbstractLinkView<M>.getViewer()\n" + 
 			"----------\n" + 
 			"2. ERROR in X.java (at line 11)\n" + 
 			"	public SheetViewer getViewer() { return null; }	\n" + 
Index: src/org/eclipse/jdt/core/tests/compiler/regression/AmbiguousMethodTest.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/AmbiguousMethodTest.java,v
retrieving revision 1.22
diff -u -r1.22 AmbiguousMethodTest.java
--- src/org/eclipse/jdt/core/tests/compiler/regression/AmbiguousMethodTest.java	6 Nov 2006 10:56:00 -0000	1.22
+++ src/org/eclipse/jdt/core/tests/compiler/regression/AmbiguousMethodTest.java	7 Nov 2006 12:39:21 -0000
@@ -1312,7 +1312,7 @@
 		"2. ERROR in X.java (at line 10)\n" + 
 		"	public abstract class X implements J, K {\n" + 
 		"	                      ^\n" + 
-		"The return type is incompatible with I.foo(Number), K.foo(Number), J.foo(Number)\n" + 
+		"The return type is incompatible with K.foo(Number), J.foo(Number)\n" + 
 		"----------\n");
 }
 // https://bugs.eclipse.org/bugs/show_bug.cgi?id=162065