php - Twig block calling with parameters -

i kinda new symfony , twig. trying override default twig form template in vendor\symfony\symfony\src\symfony\bridge\twig\resources\views\form\form_div_layout.html.twig (symfony 3.2.6)

as far know, block can defined , used in other part of template

{% block fooblock %} // block body {% endblock %} 

when parameters passed into, macro should rather used

{% macro barmarco(param1, param2, param3) %} // macro body using param1, param2, param3 etc, {% endmacro %} 

in mentioned above file found like. definition of block:

{%- block form_errors -%}     {%- if errors|length > 0 -%}     <ul>         {%- error in errors -%}             <li>{{ error.message }}</li>         {%- endfor -%}     </ul>     {%- endif -%} {%- endblock form_errors -%} 

and usage:

{%- block form_row -%}     <div>         {{- form_label(form) -}}         {{- form_errors(form) -}}         {{- form_widget(form) -}}     </div> {%- endblock form_row -%} 

and here's question: why block called param (form). thought macro should invoked this?