[Issue 20007] Add a new expression similar to the C `__COUNTER__` macro

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20007

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Add a new expression        |Add a new expression
                   |similar to the C            |similar to the C
                   |__COUNTER__ macro           |`__COUNTER__` macro

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