icsharpcode/NRefactory — pull request #321 by luiscubal (2013-09-07 22:27:15+00:00)
Title: Fixed bug in null analysis: Incorrect handling of null comparisons

```csharp
string x = Anything();
if (x == notNull) {
//x is correctly assumed to be not-null here
} else {
//x was incorrectly assumed to be null here -- we can't possibly know that.
}