Argument from caller macro is incorrectly passed through to callee macro?

[jgerigmeyer]

If a macro is called (using {% call %}) with an argument, and the caller() is itself a macro that accepts an argument with the same name with a default of none, the argument from the caller macro is incorrectly passed through to the callee macro. That sounds ridiculously confusing, so here's the test case:

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

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

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

When rendered via jinja2, this is the output:

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

However, when rendered via nunjucks, the output is:

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

This seems to only happen when the default for the inner arg is none; it doesn't occur when the default is '' or false.

[carljm]

Interesting! I'll look into this. I wonder if it's just arguments, or works for any variable of a matching name in the calling namespace...

[carljm]

This was partly fixed by #667 -- macro frames are now totally separated from the calling frame, so there's no longer any way for a macro to reach out and see or touch its calling frame. So you can no longer see this behavior with macro arguments with a default of none. Looking into whether it can still crop up in other situations...

[jgerigmeyer]

I'm still seeing this bug (or seeing it again?):

http://jsfiddle.net/jgerigmeyer/tro6jhy9/1/
http://jsfiddle.net/jgerigmeyer/6cL8wqd7/1/