gistfile1.txt

super.mustache:
<div>
{{#list}}
<span>{{item}}</span>
{{/list}}
</div>

sub.mustache (not the same):
{{<super}}
{{#list}}
<span>{{item}}</span>
{{/list}}
{{/super}}

sub.mustache (the same):
{{<super}}
{{#list}}
{{#list}}
<span>{{item}}</span>
{{/list}}
{{/list}}
{{/super}}

Using $ instead to replace with the same content:

super.mustache:
<div>
{{$list}}
<span>{{item}}</span>
{{/list}}
</div>

sub.mustache:
{{<super}}
{{$list}}
<span>{{item}}</span>
{{/list}}
{{/super}}

Using ^ could make sense -- this works as long as list is undefined:

super.mustache:
<div>
{{^list}}
<span>{{item}}</span>
{{/list}}
</div>

sub.mustache:
{{<super}}
{{^list}}
<span>{{item}}</span>
{{/list}}
{{/super}}