tuple unpacking in function argument list

[robertwb]

Python 2 has this ugly feature:

def func((a,b)):
    return a+b

arg = (1,2)
func(arg)

The obvious implementations is a transformation into

def func(__noname_arg):
    (a,b) = __noname_arg
    BODY

This feature has been removed in Python 3 for obvious reasons, but fully supporting Python 2 syntax implies supporting this as well.

Currently, the parser even parses this incorrectly and does not raise an error, despite it not being supported and failing at a later stage.

Migrated from http://trac.cython.org/ticket/692

[robertwb]

scoder changed component from Parsing to Python Semantics
commented