These methods should always return a str, it's only the default abstract
implementation that doesn't. They can be marked "abstract" by raising
NotImplementedError(), which requires subclasses to override the method
with the proper return type.

Signed-off-by: John Snow <js...@redhat.com>
---
 scripts/qapi/schema.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index c5fdd625452..4600a566005 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -233,8 +233,8 @@ def visit(self, visitor):
 class QAPISchemaType(QAPISchemaEntity):
     # Return the C type for common use.
     # For the types we commonly box, this is a pointer type.
-    def c_type(self):
-        pass
+    def c_type(self) -> str:
+        raise NotImplementedError()
 
     # Return the C type to be used in a parameter list.
     def c_param_type(self):
@@ -244,8 +244,8 @@ def c_param_type(self):
     def c_unboxed_type(self):
         return self.c_type()
 
-    def json_type(self):
-        pass
+    def json_type(self) -> str:
+        raise NotImplementedError()
 
     def alternate_qtype(self):
         json2qtype = {
-- 
2.41.0


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