Extracting the left operand name of an infix expression using an unapply

[hmemcpy]

Fixes #303

This works around a renamed API between SDK versions.

[hmemcpy]

I ended up extracting a helper function instead of going the sdkcompat route. If there is a better suggestion, I'd love to hear it!

[chaoren]

Would get first child work?

[hmemcpy]

Hmm, I haven't checked, to be honest.
I used the lOp() API from your suggestion, back when I implemented specs2 support.
If I recall correctly, my original implementation had looking up a child REFERENCE_EXPRESSION... see that commit here

Perhaps I cold just really look up the first child and it would work. Certainly would be cleaner than calling Scala-specific constructs from Java.

[hmemcpy]

After taking an additional look, seems that firstChild would work here, as it gives me the Literal element.

[chaoren]

Merged. Thanks.