scala/scala — pull request #2962 by densh (2013-09-18 15:41:05+00:00)
Title: Quasiquotes: add syntactic extractor for assignment/update trees

There are three kinds of assign-like trees:
```
1. Assign(lhs, rhs) // $lhs = $rhs
3. AssignOrNamedArg(lhs, rhs) // $lhs = $rhs
2. Apply(Select(f, nme.update), args :+ rhs) // $f(..$args) = $rhs
```
New syntactic combinator unifies all of them and lets users not to think
about these implementations details.