Fix module-level autolocking causing compiler crash

Cython/Compiler/Symtab.py

@@ -2027,6 +2027,12 @@ class ModuleScope(Scope):
         from .TypeInference import PyObjectTypeInferer
         PyObjectTypeInferer().infer_types(self)
 
+    def declare_autolocked(self, node):
+        # Add an entry for autolocked cypclass
+        if not (node.type.is_cyp_class and node.type.lock_mode == "autolock"):
+            error(node.pos, "Trying to autolock a non (autolocked) cypclass object !")
+        self.autolocked_nodes.append(node)
+
 
 class LocalScope(Scope):