Cpp: Fix CppClassType is_subclass crashing with types without base classes

b4ab48cf · gsamain · Xavier Thompson · f0d21189 · b4ab48cf
Commit b4ab48cf authored Mar 25, 2019 by gsamain Committed by Xavier Thompson Aug 17, 2020
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Cython/Compiler/PyrexTypes.py Cython/Compiler/PyrexTypes.py +4 -3

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--- a/Cython/Compiler/PyrexTypes.py
+++ b/Cython/Compiler/PyrexTypes.py
@@ -3943,9 +3943,10 @@ class CppClassType(CType):
    def is_subclass(self, other_type):
        if self.same_as_resolved_type(other_type):
            return 1
-        for base_class in self.base_classes:
-            if base_class.is_subclass(other_type):
-                return 1
+        if self.base_classes:
+            for base_class in self.base_classes:
+                if base_class.is_subclass(other_type):
+                    return 1
        return 0

    def set_scope(self, scope):