fix for kwargs params

jedi/evaluate/param.py

@@ -1,5 +1,4 @@
 import copy
-from itertools import chain
 
 from jedi._compatibility import unicode, zip_longest
 from jedi.parser import representation as pr
@@ -132,7 +131,7 @@ def get_params(evaluator, func, var_args):
             array_type = pr.Array.DICT
             if non_matching_keys:
                 keys, values = zip(*non_matching_keys)
-                values = list(chain(*values))
+                values = [helpers.stmts_to_stmt(list(v)) for v in values]
             non_matching_keys = []
         else:
             # normal param

test/static_analysis/star_arguments.py

@@ -47,5 +47,17 @@ kwargs_test(c=3)
 kwargs_test(b=2)
 #! 22 type-error-keyword-argument
 kwargs_test(b=2, c=3, d=4)
-#! 22 type-error-multiple-values
+#! 11 type-error-multiple-values
 kwargs_test(b=2, c=3, a=4)
+
+
+def kwargs_nested(**kwargs):
+    return kwargs_test(b=2, **kwargs)
+
+kwargs_nested(c=3)
+#! 13 type-error-too-few-arguments
+kwargs_nested()
+#! 19 type-error-keyword-argument
+kwargs_nested(c=2, d=4)
+#! 13 type-error-multiple-values
+kwargs_nested(c=2, a=4)