add top-level check that error wasnt previously set

sandbubbles · sandbubbles · commit a4b29d8ef87e · 2024-10-21T09:41:51.000+02:00
diff --git a/vyper/codegen/ir_node.py b/vyper/codegen/ir_node.py
@@ -382,11 +382,16 @@ def is_complex_ir(self):
     # useful for overriding an error message generated by a helper
     # function with a more specific error message.
     def set_error_msg(self, error_msg: str) -> None:
+        if self.error_msg is not None:
+            raise CompilerPanic(f"{self.value} already has error message {self.error_msg}")
+        self._set_error_msg(error_msg)
+
+    def _set_error_msg(self, error_msg: str) -> None:
         if self.error_msg is not None:
             return
         self.error_msg = error_msg
         for arg in self.args:
-            arg.set_error_msg(error_msg)
+            arg._set_error_msg(error_msg)
 
     # get the unique symbols contained in this node, which provides
     # sanity check invariants for the optimizer.
