[Issue 24352] New: std.format: 'r' format cannot be checked at compile time

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24352

          Issue ID: 24352
           Summary: std.format: 'r' format cannot be checked at compile
                    time
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: ogion.art at gmail.com

Related: https://issues.dlang.org/show_bug.cgi?id=24351

```
import std.format : format;
int x = cast(int)'x';
auto s1 = format("%r", x); // Works
auto s2 = format!"%r"(x); /* Error: reinterpreting cast from `int*` to
`const(char)*` is not supported in CTFE */
```

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