Pass parameters by keyword name when inferring sequences.

Close pylint-dev/pylint#2526

Author: PCManticore

ChangeLog

@@ -6,6 +6,10 @@ What's New in astroid 2.1.0?
 ============================
 Release Date: TBA
 
+   * Pass parameters by keyword name when inferring sequences.
+
+     Close PyCQA/pylint#2526
+
    * Correct line numbering for f-strings for complex embedded expressions
 
      When a f-string contained a complex expression, such as an attribute access,

astroid/inference.py

@@ -83,8 +83,9 @@ def infer_sequence(self, context=None):
         yield self
     else:
         values = _infer_sequence_helper(self, context)
-        new_seq = type(self)(self.lineno, self.col_offset, self.parent)
+        new_seq = type(self)(lineno=self.lineno, col_offset=self.col_offset, parent=self.parent)
         new_seq.postinit(values)
+
         yield new_seq
 
 

astroid/tests/unittest_inference.py

@@ -4730,5 +4730,16 @@ def foo(self):
     assert inferred[0].value == 2
 
 
+def test_inferred_sequence_unpacking_works():
+    inferred = next(extract_node("""
+    def test(*args):
+        return (1, *args)
+    test(2) #@
+    """).infer())
+    assert isinstance(inferred, nodes.Tuple)
+    assert len(inferred.elts) == 2
+    assert [value.value for value in inferred.elts] == [1, 2]
+
+
 if __name__ == '__main__':
     unittest.main()