__FILE__ and __LINE__ in case of import expression

[Andrey Zherikov]

On Friday, 21 August 2020 at 22:34:49 UTC, Adam D. Ruppe wrote:
> On Friday, 21 August 2020 at 22:12:48 UTC, Steven Schveighoffer 
> wrote:
>> Who does that though?
>
> An incompetent coder:
>
> http://dpldocs.info/experimental-docs/source/arsd.cgi.d.html#L5713
> http://dpldocs.info/experimental-docs/source/arsd.cgi.d.html#L5943
> http://dpldocs.info/experimental-docs/source/arsd.cgi.d.html#L6018
> http://dpldocs.info/experimental-docs/source/arsd.cgi.d.html#L6058

Even this approach can lead to unclear result if you move 
'q{...}' outside of mixin:
=========================
void test(string file = __FILE__, size_t line = __LINE__)
{
     writefln("file: '%s', line: '%s'", file, line);
}

int main(string[] args)
{
     enum code = q{
         // empty line 15
         // empty line 16
         // empty line 17
         // empty line 18
         // empty line 19
         test(); // line 20
     };

     test();        // line 23
     mixin(code);   // line 24
     test();        // line 25
     return 0;      // line 26
}                  // line 27
===========================

The output is the following:
file: 'test.d', line: '23'
file: 'test.d-mixin-24', line: '30'
file: 'test.d', line: '25'

Note that there is no line 30!