Add more context when raising an error for a typevar

saulshanabrook · saulshanabrook · commit 0dbb76dc19ed · 2025-06-20T13:35:33.000+01:00
diff --git a/python/egglog/declarations.py b/python/egglog/declarations.py
@@ -308,7 +308,7 @@ class ClassTypeVarRef:
     module: str
 
     def to_just(self) -> JustTypeRef:
-        msg = "egglog does not support generic classes yet."
+        msg = f"{self}: egglog does not support generic classes yet."
         raise NotImplementedError(msg)
 
     def __str__(self) -> str:
