I think it is correct to abort on a conversion operator. And yes, you can
get a call to a conversion operator where src type equals dest type, but it
would be an explicit call:
```struct X {
operator X();
};
...
X x;
x.operator X();```
The strictest condition is an implicit call to a conversion operator (because
an explicit call can be rewritten to auto, the operator will be still called).
But these are pretty rare, so we can just stop if we see any conversion
operator call.
You can remove E2, by the way:
```if (E != E->IgnoreConversionOperator()) ...```
http://llvm-reviews.chandlerc.com/D392
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