fix(pattern): ForEachNode#replaceNode (#2266)

* fix(pattern): ForEachNode#replaceNode

* comment added

* fix check style

src/main/java/spoon/pattern/internal/node/ForEachNode.java

@@ -53,6 +53,13 @@ public ForEachNode() {
 	@Override
 	public boolean replaceNode(RootNode oldNode, RootNode newNode) {
 		if (iterableParameter == oldNode) {
+			//before defined iterable parameter has to be replaced by another iterable parameter
+			//May be it makes no sense, because
+			//1) the iterable parameter has to be defined first
+			//2) then ForEachNode can be created for that
+			//3) then this method might be called to replace iterable parameter again
+			//... but does that use case makes sense? Probably not.
+			iterableParameter = (PrimitiveMatcher) newNode;
 			return true;
 		}
 		if (iterableParameter.replaceNode(oldNode, newNode)) {