4969 – nothrow check can't handle multiple catches

This code should compile:
class MyException : Exception
{
 this()
 {
 super("An exception!");
 }
}
void throwAway()
{
 throw new MyException;
}
void cantthrow() nothrow
{
 try
 throwAway();
 catch(MyException me)
 assert(0);
 catch(Exception e)
 assert(0);
}
void main()
{
}
It doesn't. Instead, you get this error:
d.d(14): Error: function d.cantthrow 'cantthrow' is nothrow yet may throw
If you remove catch(MyException e) and its body, then the program compiles. Given that the catch block that catches MyException cannot throw an exception of its own and that the catch block following it catches Exception (and therefore will catch all exceptions) and cannot throw an exception, the compiler should be able to clearly determine that no exception can escape cantthrow, but apparently, it can't.

DMD pull #145.
https://github.com/D-Programming-Language/dmd/pull/145 

https://github.com/D-Programming-Language/dmd/commit/1809f7b5baaf6bb34879f19f5ba75af5f997c920
https://github.com/D-Programming-Language/dmd/commit/d4e602c2e2d2516f2958a762073ea7f6c98914f6