[Issue 23792] New: lexer warns about preprocessor inside token strings

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23792

          Issue ID: 23792
           Summary: lexer warns about preprocessor inside token strings
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P4
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dkorpel at live.nl

See https://forum.dlang.org/post/vqydbhpzbcqbaxfiixax@forum.dlang.org

```
enum s = q{
#include <test>
};
```

> Warning: C preprocessor directive #include is not supported

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