Cannot reference outer scopes from inside a {% call %} block.

[carljm]

Originally reported by @jgerigmeyer at #481 (comment) -- all of the below copied from his report:

Consider the following test case:

{% macro inner(class=none) %}
  <div class="{{ class }}">{{ caller() }}</div>
{% endmacro %}

{% macro outer(class=none) %}
  <div class="{{ class }}">
    {% call inner() %}
      {{ class }}
    {% endcall %}
  </div>
{% endmacro %}

{{ outer(class='outer') }}

Jinja2 outputs as expected:

<div class="outer">
  <div class="None">
    outer
  </div>
</div>

But nunjucks outputs:

<div class="outer">
  <div class="">
  </div>
</div>

[carljm]

This is related to #664; it has to do with how the frame stack for a {% call %} block is constructed.

[atheros]

This is a very annoying bug. You cannot take full advantage of call/caller feature without it.

Are there any plans for fixing this bug?

[ArmorDarks]

yeap, macros scopes are kinda buggy right now :(

@atheros as far as I remember, making call with {% call %} makes it work:

{% call outer(class='outer) %}{% endcall %}

Ugly, but better than nothing.

[atheros]

It doesn't work, the result is the same.

[ArmorDarks]

You're probably on Nunjucks 3.0.0? As far as I remember, in 3.0.0 it is impossible to pass external variable into macros at all, due to bug described here #912

[atheros]

Yes, 3.0.0. And I cannot pass variables to call block, which pretty much makes call useless, except for very simple cases.

Anyway downgrading to 2.5.2 fixes the issue. Thanks for the hint @ArmorDarks

Interestingly, set block in macros doesn't work there (bug #914), so it's an older issue.

[jgerigmeyer]

I note that this bug still exists in v3.2.0.