public static @Nullable LighterASTNode findExpressionChild(@NotNull LighterAST tree, @Nullable LighterASTNode node) {
    return LightTreeUtil.firstChildOfType(tree, node, ElementType.EXPRESSION_BIT_SET);
  }
public static @Nullable LighterASTNode findExpressionChild(@NotNull LighterAST tree, @Nullable LighterASTNode node)