Do not try to automatically infer ctuple types if one of the items is a memoryview.

Cython/Compiler/ExprNodes.py

@@ -7757,10 +7757,10 @@ class TupleNode(SequenceNode):
         if self.mult_factor or not self.args:
             return tuple_type
         arg_types = [arg.infer_type(env) for arg in self.args]
-        if any(type.is_pyobject or type.is_unspecified or type.is_fused for type in arg_types):
+        if any(type.is_pyobject or type.is_memoryviewslice or type.is_unspecified or type.is_fused
+               for type in arg_types):
             return tuple_type
-        else:
-            return env.declare_tuple_type(self.pos, arg_types).type
+        return env.declare_tuple_type(self.pos, arg_types).type
 
     def analyse_types(self, env, skip_children=False):
         if len(self.args) == 0:
@@ -7774,7 +7774,8 @@ class TupleNode(SequenceNode):
                     arg.starred_expr_allowed_here = True
                 self.args[i] = arg.analyse_types(env)
         if (not self.mult_factor and
-                not any((arg.is_starred or arg.type.is_pyobject or arg.type.is_fused) for arg in self.args)):
+                not any((arg.is_starred or arg.type.is_pyobject or arg.type.is_memoryviewslice or arg.type.is_fused)
+                        for arg in self.args)):
             self.type = env.declare_tuple_type(self.pos, (arg.type for arg in self.args)).type
             self.is_temp = 1
             return self