Bug or intentional error?

[Meta via Digitalmars-d]

On Tuesday, 7 July 2015 at 23:40:55 UTC, Tofu Ninja wrote:
> On Tuesday, 7 July 2015 at 20:08:10 UTC, Daniel N wrote:
>> Error: this is not in a class or struct scope
>>
>> mixin template NodeT1(T = typeof(this))
>> {
>> }
>> mixin template NodeT2()
>> {
>>   alias T = typeof(this);
>> }
>>
>> struct Node
>> {
>>   mixin NodeT1; // fail
>>   mixin NodeT2; // pass
>> }
> Pretty sure that is expected. Default params are evaluated in 
> the declaration scope, so typeof(this) is not defined in 
> NodeT1. The only things that break this rule are the special 
> identifiers like __FILE__ which are evaluated at the 
> instantiation/call site.

 From http://dlang.org/template-mixin.html:

Unlike a template instantiation, a template mixin's **body** is 
evaluated within the scope where the mixin appears, not where the 
template declaration is defined.

So it looks like your code is working as intended.