### Eclipse Workspace Patch 1.0
#P org.eclipse.jdt.core.tests.compiler
#P org.eclipse.jdt.core
Index: compiler/org/eclipse/jdt/internal/compiler/lookup/Scope.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.jdt.core/compiler/org/eclipse/jdt/internal/compiler/lookup/Scope.java,v
retrieving revision 1.307
diff -u -r1.307 Scope.java
--- compiler/org/eclipse/jdt/internal/compiler/lookup/Scope.java	16 May 2007 20:49:40 -0000	1.307
+++ compiler/org/eclipse/jdt/internal/compiler/lookup/Scope.java	22 May 2007 07:44:46 -0000
@@ -2536,12 +2536,12 @@
 			nextCandidate: for (int k = 0, max = mecs.length; k < max; k++) {
 				TypeBinding mec = mecs[k];
 				if (mec == null) continue nextCandidate;
-				Set invalidInvocations = (Set) invocations.get(mec);
-				int invalidSize = invalidInvocations.size();
-				if (invalidSize > 1) {
-					TypeBinding[] collisions;
-					invalidInvocations.toArray(collisions = new TypeBinding[invalidSize]);
-					problemReporter().superinterfacesCollide(collisions[0].erasure(), typeRef, collisions[0], collisions[1]);
+				Object value = invocations.get(mec);
+				if (value instanceof List) {
+					List invalidInvocations = (List) value;
+					TypeBinding firstInvocation = (TypeBinding) invalidInvocations.get(0);
+					TypeBinding secondInvocation = (TypeBinding) invalidInvocations.get(1);
+					problemReporter().superinterfacesCollide(firstInvocation.erasure(), typeRef, firstInvocation, secondInvocation);
 					type.tagBits |= TagBits.HierarchyHasProblems;
 					return true;
 				}
@@ -2756,11 +2756,13 @@
 		return false;
 	}
 
-	private TypeBinding leastContainingInvocation(TypeBinding mec, Set invocations, List lubStack) {
-		if (invocations == null) return mec; // no alternate invocation
-		int length = invocations.size();
+	private TypeBinding leastContainingInvocation(TypeBinding mec, Object invocationValue, List lubStack) {
+		if (invocationValue == null) return mec; // no alternate invocation
+		if (!(invocationValue instanceof List)) { // only one invocation, simply return it (list only allocated if more than one)
+			return (TypeBinding) invocationValue;
+		}
+		List invocations = (List) invocationValue;
 		Iterator iter = invocations.iterator();
-		if (length == 1) return (TypeBinding) iter.next();
 
 		// if mec is an array type, intersect invocation leaf component types, then promote back to array
 		int dim = mec.dimensions();
@@ -2928,7 +2930,7 @@
 		for (int i = 0; i < length; i++) {
 			TypeBinding mec = mecs[i];
 			if (mec == null) continue;
-			mec = leastContainingInvocation(mec, (Set)invocations.get(mec), lubStack);
+			mec = leastContainingInvocation(mec, invocations.get(mec), lubStack);
 			if (mec == null) return null;
 			int dim = mec.dimensions();
 			if (commonDim == -1) {
@@ -3001,9 +3003,7 @@
 		TypeBinding leafType = firstType.leafComponentType();
 		TypeBinding firstErasure = (leafType.isTypeVariable() || leafType.isWildcard()/*&& !leafType.isCapture()*/) ? firstType : firstType.erasure();
 		if (firstErasure != firstType) {
-			Set someInvocations = new HashSet(1);
-			someInvocations.add(firstType);
-			allInvocations.put(firstErasure, someInvocations);
+			allInvocations.put(firstErasure, firstType);
 		}						
 		typesToVisit.add(firstType);
 		int max = 1;
@@ -3063,9 +3063,7 @@
 						max++;
 						TypeBinding superTypeErasure = (firstBound.isTypeVariable() || firstBound.isWildcard() /*&& !itsInterface.isCapture()*/) ? superType : superType.erasure();
 						if (superTypeErasure != superType) {
-							Set someInvocations = new HashSet(1);
-							someInvocations.add(superType);
-							allInvocations.put(superTypeErasure, someInvocations);
+							allInvocations.put(superTypeErasure, superType);
 						}						
 					}
 					continue;
@@ -3082,9 +3080,7 @@
 						max++;
 						TypeBinding superTypeErasure = (itsInterface.isTypeVariable() || itsInterface.isWildcard() /*&& !itsInterface.isCapture()*/) ? superType : superType.erasure();
 						if (superTypeErasure != superType) {
-							Set someInvocations = new HashSet(1);
-							someInvocations.add(superType);
-							allInvocations.put(superTypeErasure, someInvocations);
+							allInvocations.put(superTypeErasure, superType);
 						}						
 					}
 				}
@@ -3097,9 +3093,7 @@
 					max++;
 					TypeBinding superTypeErasure = (itsSuperclass.isTypeVariable() || itsSuperclass.isWildcard() /*&& !itsSuperclass.isCapture()*/) ? superType : superType.erasure();
 					if (superTypeErasure != superType) {
-						Set someInvocations = new HashSet(1);
-						someInvocations.add(superType);
-						allInvocations.put(superTypeErasure, someInvocations);
+						allInvocations.put(superTypeErasure, superType);
 					}
 				}
 			}
@@ -3128,10 +3122,24 @@
 						continue nextSuperType;
 					}
 					// record invocation
-					Set someInvocations = (Set) allInvocations.get(erasedSuperType);
-					if (someInvocations == null) someInvocations = new HashSet(1);
-					someInvocations.add(match);
-					allInvocations.put(erasedSuperType, someInvocations);
+					Object value = allInvocations.get(erasedSuperType);
+					if (value == null) {
+						allInvocations.put(erasedSuperType, match);
+					} else if (!(value instanceof List)) {
+						if (match != value) {
+							// using a list to record invocations in order (188103)
+							List someInvocations = new ArrayList(2);
+							someInvocations.add(value);
+							someInvocations.add(match);
+							allInvocations.put(erasedSuperType, someInvocations);
+						}
+					} else {
+						List someInvocations = (List) value;
+						if (!someInvocations.contains(match)) {
+							someInvocations.add(match);
+							allInvocations.put(erasedSuperType, someInvocations);
+						}
+					}
 				}
 				continue nextOtherType;
 			}
@@ -3154,10 +3162,24 @@
 					}
 				}
 				// record invocation
-				Set someInvocations = (Set) allInvocations.get(erasedSuperType);
-				if (someInvocations == null) someInvocations = new HashSet(1);
-				someInvocations.add(match);
-				allInvocations.put(erasedSuperType, someInvocations);
+				Object value = allInvocations.get(erasedSuperType);
+				if (value == null) {
+					allInvocations.put(erasedSuperType, match);
+				} else if (!(value instanceof List)) {
+					if (match != value) {
+						// using a list to record invocations in order (188103)
+						List someInvocations = new ArrayList(2);
+						someInvocations.add(value);
+						someInvocations.add(match);
+						allInvocations.put(erasedSuperType, someInvocations);
+					}
+				} else {
+					List someInvocations = (List) value;
+					if (!someInvocations.contains(match)) {
+						someInvocations.add(match);
+						allInvocations.put(erasedSuperType, someInvocations);
+					}
+				}
 			}				
 		}
 		// eliminate non minimal super types