1 files changed, 4 insertions, 0 deletions
diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index 6469000f7..242a97d6a 100644
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -14549,6 +14549,10 @@ class AnnotationNode(ExprNode):
                     annotation = value
             if explicit_pytype and explicit_ctype:
                 warning(annotation.pos, "Duplicate type declarations found in signature annotation", level=1)
+        elif isinstance(annotation, TupleNode):
+            warning(annotation.pos,
+                    "Tuples cannot be declared as simple tuples of types. Use 'tuple[type1, type2, ...]'.", level=1)
+            return [], None
 
         with env.new_c_type_context(in_c_type_context=explicit_ctype):
             arg_type = annotation.analyse_as_type(env)