from http://forum.dlang.org/thread/ggyxirvvnypggstfkbzj@forum.dlang.org#post-ggyxirvvnypggstfkbzj:40forum.dlang.org

~~~char2.d
void main ()
{
   import std.stdio;
   import std.conv;
   char [2] win = [0, 'X'];
   auto ne = new Exception ("A " ~ win.to!string ~ " B");
   try throw ne;
   catch (Exception e)
      writeln ("exception caught: e.msg = <", e.msg, ">");
   throw ne;
}
~~~

Output:

exception caught: e.msg = <A X B>
object.Exception@char2.d(6): A              <--- truncated at \0
[...]

Commment from P.B.: This is definitely a bug. The problem is that the D runtime uses `fprintf` to print the exception's error message, when it should be using `fwrite`:

https://github.com/dlang/druntime/blob/v2.094.2/src/rt/dmain2.d#L733