### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: compiler/org/eclipse/jdt/internal/compiler/lookup/BinaryTypeBinding.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/lookup/BinaryTypeBinding.java,v
retrieving revision 1.131
diff -u -r1.131 BinaryTypeBinding.java
--- compiler/org/eclipse/jdt/internal/compiler/lookup/BinaryTypeBinding.java	19 Nov 2010 14:22:00 -0000	1.131
+++ compiler/org/eclipse/jdt/internal/compiler/lookup/BinaryTypeBinding.java	1 Dec 2010 12:44:57 -0000
@@ -1063,9 +1063,15 @@
 			method.tagBits |= TagBits.HasMissingType;
 		}
 	}
+	long sourceLevel = this.environment.globalOptions.originalSourceLevel;
 	for (int i = method.parameters.length; --i >= 0;) {
 		TypeBinding resolvedType = resolveType(method.parameters[i], this.environment, true /* raw conversion */);
-		method.parameters[i] = resolvedType;
+		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=331446
+		if (sourceLevel < ClassFileConstants.JDK1_5) {
+			method.parameters[i] = resolvedType.erasure();
+		} else {
+			method.parameters[i] = resolvedType;
+		}
 		if ((resolvedType.tagBits & TagBits.HasMissingType) != 0) {
 			method.tagBits |= TagBits.HasMissingType;
 		}
#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 1.219
diff -u -r1.219 MethodVerifyTest.java
--- src/org/eclipse/jdt/core/tests/compiler/regression/MethodVerifyTest.java	1 Dec 2010 09:32:23 -0000	1.219
+++ src/org/eclipse/jdt/core/tests/compiler/regression/MethodVerifyTest.java	1 Dec 2010 12:45:00 -0000
@@ -11417,8 +11417,8 @@
 		false,
 		compilerOptions14);
 }
-//https://bugs.eclipse.org/bugs/show_bug.cgi?id=331446 
-public void _test331446() {
+// https://bugs.eclipse.org/bugs/show_bug.cgi?id=331446 
+public void test331446() {
 	Map compilerOptions15 = getCompilerOptions();
 	compilerOptions15.put(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, CompilerOptions.VERSION_1_5);
 	compilerOptions15.put(JavaCore.COMPILER_COMPLIANCE, JavaCore.VERSION_1_5);
@@ -11490,6 +11490,76 @@
 		compilerOptions14,
 		null);
 }
+//https://bugs.eclipse.org/bugs/show_bug.cgi?id=331446 
+public void test331446b() {
+	Map compilerOptions15 = getCompilerOptions();
+	compilerOptions15.put(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, CompilerOptions.VERSION_1_4);
+	compilerOptions15.put(JavaCore.COMPILER_COMPLIANCE, JavaCore.VERSION_1_4);
+	compilerOptions15.put(JavaCore.COMPILER_SOURCE, JavaCore.VERSION_1_4);
+	this.runConformTest(
+		new String[] {
+			"Test.java",
+			"import java.util.Comparator;\n" + 
+			"import java.util.List;\n" + 
+			"\n" + 
+			"public class Test {\n" + 
+			"	public static  void assertEquals(String message,\n" + 
+			"			Comparator comparator, List expected, List actual) {\n" + 
+			"		if (expected.size() != actual.size()) {\n" + 
+			"			//failNotEquals(message, expected, actual);\n" + 
+			"		}\n" + 
+			"		for (int i = 0, l = expected.size(); i < l; i++) {\n" + 
+			"			assertEquals(message, comparator, expected.get(i), actual.get(i));\n" + 
+			"		}\n" + 
+			"	}\n" + 
+			"	public static void assertEquals(String message,\n" + 
+			"			Comparator comparator, Object expected, Object actual) {\n" + 
+			"		if (comparator.compare(expected, actual) == 0) {\n" + 
+			"			return;\n" + 
+			"		}\n" + 
+			"		//failNotEquals(message, expected, actual);\n" + 
+			"	}\n" + 
+			"}\n" + 
+			""
+		},
+		"",
+		null,
+		true,
+		null,
+		compilerOptions15,
+		null);
+
+	Map compilerOptions14 = getCompilerOptions();
+	compilerOptions14.put(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, JavaCore.VERSION_1_2);
+	compilerOptions14.put(JavaCore.COMPILER_COMPLIANCE, JavaCore.VERSION_1_4);
+	compilerOptions14.put(JavaCore.COMPILER_SOURCE, JavaCore.VERSION_1_3);
+	compilerOptions14.put(JavaCore.COMPILER_PB_UNNECESSARY_TYPE_CHECK, JavaCore.IGNORE);
+	this.runConformTest(
+		new String[] {
+			"X.java",
+			"import java.util.ArrayList;\n" + 
+			"import java.util.Comparator;\n" + 
+			"\n" + 
+			"public class X {\n" + 
+			"	public static void testAmbiguity() {\n" + 
+			"		Comparator comparator = new Comparator() {\n" + 
+			"			\n" + 
+			"			public int compare(Object o1, Object o2) {\n" + 
+			"				return 0;\n" + 
+			"			}\n" + 
+			"		};\n" + 
+			"		Test.assertEquals(\"Test\", comparator, new ArrayList(), new ArrayList());\n" + 
+			"	}\n" + 
+			"}\n" + 
+			"",
+		},
+		"",
+		null,
+		false,
+		null,
+		compilerOptions14,
+		null);
+}
 public void test1415Mix() {
 	Map compilerOptions15 = getCompilerOptions();
 	compilerOptions15.put(JavaCore.COMPILER_CODEGEN_TARGET_PLATFORM, CompilerOptions.VERSION_1_5);
@@ -11526,7 +11596,7 @@
 		"1. ERROR in Concrete.java (at line 1)\n" + 
 		"	public class Concrete extends Abstract {\n" + 
 		"	             ^^^^^^^^\n" + 
-		"The type Concrete must implement the inherited abstract method Generic<String>.foo(String)\n" + 
+		"The type Concrete must implement the inherited abstract method Generic<String>.foo(Object)\n" + 
 		"----------\n",
 		null,
 		false,
@@ -11562,7 +11632,7 @@
 			new String[] {
 					"Concrete.java",
 					"public class Concrete extends Abstract {\n" +
-					"    void foo(String s) {}\n" +
+					"    void foo(Object s) {}\n" +
 					"}",
 			},
 			"",