```d
struct MyType
{
ubyte val;
MyType opOpAssign(string op)(const MyType x) if(op =="^^")
{
val ^^= x.val;
}
}
MyType m;
m ^^= m;
```
==> cannot implicitly convert expression
`pow(cast(int)__powtmp1234, cast(int)x.val)` of type `int` to
`ubyte`
This is one of the bugs that we bought with the strange policy
that operators do NOT return same type as their operands.
"convert everything to int but not back" :-(
But in this special case I cannot see how to avoid this. Where do
I need to put the cast to make this conversion explicit?!?
