Although `Suite` is not an actual AST used in CPython, it's quite useful when performing some code analysis. 

`Suite` is a sequence of statements which could be used to represent a block whose context inherits from outside block's.

Also, the document said it's useful in Jython.

I wonder if we could support `unparse` for Suite through making a tiny modification to

https://github.com/python/cpython/blob/master/Tools/parser/unparse.py

def _Suite(self, tree):
      for stmt in tree.body:
         self.dispatch(stmt)