### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core
Index: compiler/org/eclipse/jdt/internal/compiler/ast/CastExpression.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/ast/CastExpression.java,v
retrieving revision 1.108
diff -u -r1.108 CastExpression.java
--- compiler/org/eclipse/jdt/internal/compiler/ast/CastExpression.java	22 Nov 2006 16:47:44 -0000	1.108
+++ compiler/org/eclipse/jdt/internal/compiler/ast/CastExpression.java	22 Feb 2007 18:05:34 -0000
@@ -367,7 +367,7 @@
 			return;
 		}
 		expression.generateCode(currentScope, codeStream, valueRequired || needRuntimeCheckcast);
-		if (needRuntimeCheckcast && this.expression.postConversionType(currentScope) != this.resolvedType) { // no need to issue a checkcast if already done as genericCast
+		if (needRuntimeCheckcast && this.expression.postConversionType(currentScope) != this.resolvedType.erasure()) { // no need to issue a checkcast if already done as genericCast
 			codeStream.checkcast(this.resolvedType);
 		}
 		if (valueRequired) {
#P org.eclipse.jdt.core.tests.compiler
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 1.598
diff -u -r1.598 GenericTypeTest.java
--- src/org/eclipse/jdt/core/tests/compiler/regression/GenericTypeTest.java	22 Feb 2007 15:39:04 -0000	1.598
+++ src/org/eclipse/jdt/core/tests/compiler/regression/GenericTypeTest.java	22 Feb 2007 18:05:47 -0000
@@ -36637,4 +36637,87 @@
 		"The generic class X<T>.Y may not subclass java.lang.Throwable\n" + 
 		"----------\n");
 }
+//https://bugs.eclipse.org/bugs/show_bug.cgi?id=172913
+public void test1107() {
+		this.runConformTest(
+			new String[] {
+				"X.java",
+				"import java.util.ArrayList;\n" + 
+				"import java.util.Collection;\n" + 
+				"import java.util.HashMap;\n" + 
+				"import java.util.Iterator;\n" + 
+				"import java.util.List;\n" + 
+				"\n" + 
+				"public class X {\n" + 
+				"  private void processLocks(HashMap locksMap, Object key) {\n" + 
+				"    for (Iterator iter = locksMap.keySet().iterator(); iter.hasNext();) {\n" + 
+				"      Object call = iter.next();\n" + 
+				"      List locks = externLocks((Collection) locksMap.get(call), call);\n" + 
+				"      // ...\n" + 
+				"    }\n" + 
+				"  }\n" + 
+				"  private List externLocks(Collection locks, Object call) {\n" + 
+				"    List result = new ArrayList();\n" + 
+				"    // ..\n" + 
+				"    return result;\n" + 
+				"  }\n" + 
+				"}\n",
+			},
+			"");		
+		// ensure only one instance of: checkcast java.util.Collection
+		String expectedOutput =
+			"  // Method descriptor #15 (Ljava/util/HashMap;Ljava/lang/Object;)V\n" + 
+			"  // Stack: 3, Locals: 6\n" + 
+			"  private void processLocks(java.util.HashMap locksMap, java.lang.Object key);\n" + 
+			"     0  aload_1 [locksMap]\n" + 
+			"     1  invokevirtual java.util.HashMap.keySet() : java.util.Set [16]\n" + 
+			"     4  invokeinterface java.util.Set.iterator() : java.util.Iterator [22] [nargs: 1]\n" + 
+			"     9  astore_3 [iter]\n" + 
+			"    10  goto 38\n" + 
+			"    13  aload_3 [iter]\n" + 
+			"    14  invokeinterface java.util.Iterator.next() : java.lang.Object [28] [nargs: 1]\n" + 
+			"    19  astore 4 [call]\n" + 
+			"    21  aload_0 [this]\n" + 
+			"    22  aload_1 [locksMap]\n" + 
+			"    23  aload 4 [call]\n" + 
+			"    25  invokevirtual java.util.HashMap.get(java.lang.Object) : java.lang.Object [34]\n" + 
+			"    28  checkcast java.util.Collection [38]\n" + 
+			"    31  aload 4 [call]\n" + 
+			"    33  invokespecial X.externLocks(java.util.Collection, java.lang.Object) : java.util.List [40]\n" + 
+			"    36  astore 5\n" + 
+			"    38  aload_3 [iter]\n" + 
+			"    39  invokeinterface java.util.Iterator.hasNext() : boolean [44] [nargs: 1]\n" + 
+			"    44  ifne 13\n" + 
+			"    47  return\n" + 
+			"      Line numbers:\n" + 
+			"        [pc: 0, line: 9]\n" + 
+			"        [pc: 13, line: 10]\n" + 
+			"        [pc: 21, line: 11]\n" + 
+			"        [pc: 38, line: 9]\n" + 
+			"        [pc: 47, line: 14]\n" + 
+			"      Local variable table:\n" + 
+			"        [pc: 0, pc: 48] local: this index: 0 type: X\n" + 
+			"        [pc: 0, pc: 48] local: locksMap index: 1 type: java.util.HashMap\n" + 
+			"        [pc: 0, pc: 48] local: key index: 2 type: java.lang.Object\n" + 
+			"        [pc: 10, pc: 47] local: iter index: 3 type: java.util.Iterator\n" + 
+			"        [pc: 21, pc: 38] local: call index: 4 type: java.lang.Object\n";
+		
+		try {
+			File f = new File(OUTPUT_DIR + File.separator + "X.class");
+			byte[] classFileBytes = org.eclipse.jdt.internal.compiler.util.Util.getFileByteContent(f);
+			ClassFileBytesDisassembler disassembler = ToolFactory.createDefaultClassFileBytesDisassembler();
+			String result = disassembler.disassemble(classFileBytes, "\n", ClassFileBytesDisassembler.DETAILED);
+			int index = result.indexOf(expectedOutput);
+			if (index == -1 || expectedOutput.length() == 0) {
+				System.out.println(Util.displayString(result, 3));
+			}
+			if (index == -1) {
+				assertEquals("Wrong contents", expectedOutput, result);
+			}
+		} catch (org.eclipse.jdt.core.util.ClassFormatException e) {
+			assertTrue(false);
+		} catch (IOException e) {
+			assertTrue(false);
+		}
+	}
 }
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