Why is the error message coming by the end of the compilation?

[bauss]

On Sunday, 15 April 2018 at 16:55:36 UTC, bauss wrote:
> On Sunday, 15 April 2018 at 15:55:15 UTC, ag0aep6g wrote:
>> On 04/15/2018 05:33 PM, bauss wrote:
>>> On Sunday, 15 April 2018 at 10:27:26 UTC, ag0aep6g wrote:
>>>> On 04/14/2018 08:56 PM, bauss wrote:
>>>>> I wish there was a way to give a mixin some kind of 
>>>>> identity like:
>>>>>
>>>>> mixin("mymixin", "somecode");
>>>>>
>>>>> Where an error message would print something like:
>>>>>
>>>>> Error in mixin("mymixin"): ...
>> [...]
>>>>     mixin("#line 1 \"mymixin\"\n" ~ "somecode;");
>>>>         /* mymixin(1): Error: undefined identifier somecode 
>>>> */
>> [...]
>>> I don't see how the #line will help because you don't know 
>>> which mixin the line would be associated with as they can 
>>> come in any order.
>>
>> I don't follow. It's not about setting the line number. The 
>> point is setting the source file name to "mymixin".
>>
>> You asked for a way associate a name with a string mixin, and 
>> have that name included in errors. As far as I see, `#line` 
>> lets you do that.
>>
>> Note how the error message in my example shows "mymixin".
>
> Oh, I'm sorry I didn't notice that, my bad.
>
> I guess adding that would be the equivalent to what my proposal 
> is.
>
> I'll give it a try and come back

It's almost as good as I want it to be, so this solution will do 
for now!