[Issue 21944] importC: Support parsing # line marker directive extensions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21944

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
                 CC|                            |bugzilla at digitalmars.com
         Resolution|FIXED                       |---

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---
Not implementing this would be a nuisance, and there'd be no way to get the
line numbers correct for debugging.

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