[Issue 18304] std.format functions with compile time format strings should be nothrow

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18304

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |b2.temp at gmx.com
         Resolution|---                         |INVALID

--- Comment #1 from basile-z <b2.temp at gmx.com> ---
Why the heck would they have to be ?

```
void main()
{
    import std;
    int i = 0;
    format!"%s"((){if (!i) throw new Exception("oops"); return "helloho"; 
}()).writeln;
}    
```

just let attribute inference do the job.

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