Use interable unpacking now that mypyc supports it (#6946)

Author: msullivan

mypy/newsemanal/semanal.py

@@ -2973,9 +2973,7 @@ def process_module_assignment(self, lvals: List[Lvalue], rval: Expression,
             # extra elements, so no error will be raised here; mypy will later complain
             # about the length mismatch in type-checking.
             elementwise_assignments = zip(rval.items, *[v.items for v in seq_lvals])
-            # TODO: use 'for rv, *lvs in' once mypyc supports it
-            for part in elementwise_assignments:
-                rv, lvs = part[0], list(part[1:])
+            for rv, *lvs in elementwise_assignments:
                 self.process_module_assignment(lvs, rv, ctx)
         elif isinstance(rval, RefExpr):
             rnode = self.lookup_type_node(rval)

mypy/semanal.py

@@ -2660,9 +2660,7 @@ def process_module_assignment(self, lvals: List[Lvalue], rval: Expression,
             # extra elements, so no error will be raised here; mypy will later complain
             # about the length mismatch in type-checking.
             elementwise_assignments = zip(rval.items, *[v.items for v in seq_lvals])
-            # TODO: use 'for rv, *lvs in' once mypyc supports it
-            for part in elementwise_assignments:
-                rv, lvs = part[0], list(part[1:])
+            for rv, *lvs in elementwise_assignments:
                 self.process_module_assignment(lvs, rv, ctx)
         elif isinstance(rval, RefExpr):
             rnode = self.lookup_type_node(rval)