Using @Delegate to add a varargs method now works in eclipse (the varargs nature of the method is preserved).

src/eclipseAgent/lombok/eclipse/agent/EclipsePatcher.java

@@ -62,6 +62,7 @@ public class EclipsePatcher extends Agent {
 			patchLombokizeAST(sm);
 			patchCatchReparse(sm);
 			patchIdentifierEndReparse(sm);
+			patchRetrieveEllipsisStartPosition(sm);
 			patchSetGeneratedFlag(sm);
 			patchHideGeneratedNodes(sm);
 			patchLiveDebug(sm);
@@ -151,6 +152,13 @@ public class EclipsePatcher extends Agent {
 				.transplant().request(StackRequest.RETURN_VALUE, StackRequest.PARAM2).build());
 	}
 	
+	private static void patchRetrieveEllipsisStartPosition(ScriptManager sm) {
+		sm.addScript(ScriptBuilder.wrapReturnValue()
+				.target(new MethodTarget("org.eclipse.jdt.core.dom.ASTConverter", "retrieveEllipsisStartPosition"))
+				.wrapMethod(new Hook("lombok.eclipse.agent.PatchFixes", "fixRetrieveEllipsisStartPosition", "int", "int", "int"))
+				.transplant().request(StackRequest.RETURN_VALUE, StackRequest.PARAM2).build());
+	}
+	
 	private static void patchSetGeneratedFlag(ScriptManager sm) {
 		sm.addScript(ScriptBuilder.addField()
 				.targetClass("org.eclipse.jdt.internal.compiler.ast.ASTNode")

src/eclipseAgent/lombok/eclipse/agent/PatchDelegate.java

@@ -166,7 +166,6 @@ public class PatchDelegate {
 				if (!Arrays.equals(mb.selector, name)) continue;
 				int paramLen = mb.parameters == null ? 0 : mb.parameters.length;
 				if (paramLen != args.length) continue;
-				// TODO check if varargs are copied or otherwise handled correctly.
 				for (int i = 0; i < paramLen; i++) {
 					if (!mb.parameters[i].erasure().isEquivalentTo(args[i])) continue methods;
 				}
@@ -328,6 +327,8 @@ public class PatchDelegate {
 		 *  }
 		 */
 		
+		boolean isVarargs = (pair.base.modifiers & ClassFileConstants.AccVarargs) != 0;
+		
 		try {
 			checkConflictOfTypeVarNames(pair, typeNode);
 		} catch (CantMakeDelegates e) {
@@ -423,6 +424,12 @@ public class PatchDelegate {
 				call.arguments[i] = new SingleNameReference(argName, pos(source));
 				Eclipse.setGeneratedBy(call.arguments[i], source);
 			}
+			if (isVarargs) {
+				method.arguments[method.arguments.length - 1].type.bits |= ASTNode.IsVarArgs;
+			}
+			for (int i = 0; i < method.arguments.length; i++) {
+				System.out.printf("Positions of marg type: %d %d\n", method.arguments[i].sourceStart(), method.arguments[i].sourceEnd());
+			}
 		}
 		
 		Statement body;

src/eclipseAgent/lombok/eclipse/agent/PatchFixes.java

@@ -44,6 +44,10 @@ public class PatchFixes {
 		return original == -1 ? end : original;
 	}
 	
+	public static int fixRetrieveEllipsisStartPosition(int original, int end) {
+		return original == -1 ? end : original;
+	}
+	
 	public static final int ALREADY_PROCESSED_FLAG = 0x800000;	//Bit 24
 	
 	public static boolean checkBit24(Object node) throws Exception {