Implemented for loops

src/core/CompileASTNode.go

@@ -28,6 +28,10 @@ func (f *Function) CompileASTNode(node ast.Node) error {
 		f.Fold(node.Condition)
 		return f.CompileIf(node)
 
+	case *ast.For:
+		f.Fold(node.Head)
+		return f.CompileFor(node)
+
 	case *ast.Loop:
 		return f.CompileLoop(node)