Dlang code mixin output

[Dicebot]

On Wednesday, 31 July 2013 at 13:25:45 UTC, JS wrote:
> On Wednesday, 31 July 2013 at 13:19:46 UTC, dennis luehring
>> >When you do that with nested templates it
>> > creates a huge mess... also errors are useless... as the
>> point to
>> > the mixin string.

There is one idiom for debugging string mixin mess:
098: // pragma(msg, "mixin_id:");
099: // pragma(msg, generated_code);
100: #line 1 "mixin_id"
101: mixin(generated_code)
102: #line 103 __FILE__

Not very convenient, but enough to get the job done.

Sonke had nice idea to improve compiler by storing mixin id as 
part of filename an preserving line numbers as-is. Somewhat 
breaking change though.