public static boolean isNullLiteralExpression(@NotNull LighterAST tree, @NotNull LighterASTNode node) {
    return node.getTokenType() == LITERAL_EXPRESSION && tree.getChildren(node).get(0).getTokenType() == JavaTokenType.NULL_KEYWORD;
  }
public static boolean isNullLiteralExpression(@NotNull LighterAST tree, @NotNull LighterASTNode node)