Cover first-class callable nodes with BC promise

Author: ondrejmirtes

src/Node/FunctionCallableNode.php

@@ -5,6 +5,7 @@
 use PhpParser\Node\Expr;
 use PhpParser\Node\Name;
 
+/** @api */
 class FunctionCallableNode extends Expr implements VirtualNode
 {
 

src/Node/InstantiationCallableNode.php

@@ -5,6 +5,7 @@
 use PhpParser\Node\Expr;
 use PhpParser\Node\Name;
 
+/** @api */
 class InstantiationCallableNode extends Expr implements VirtualNode
 {
 

src/Node/MethodCallableNode.php

@@ -5,6 +5,7 @@
 use PhpParser\Node\Expr;
 use PhpParser\Node\Identifier;
 
+/** @api */
 class MethodCallableNode extends Expr implements VirtualNode
 {
 

src/Node/StaticMethodCallableNode.php

@@ -6,6 +6,7 @@
 use PhpParser\Node\Identifier;
 use PhpParser\Node\Name;
 
+/** @api */
 class StaticMethodCallableNode extends Expr implements VirtualNode
 {