Improve LSP override error message

Ubuntu · Ubuntu · commit 80105a45dc9b · 2026-04-24T00:59:19.000Z
diff --git a/mypy/messages.py b/mypy/messages.py
@@ -1293,6 +1293,9 @@ def signature_incompatible_with_supertype(
             )
         else:
             self.note(override_str, context, offset=ALIGN_OFFSET + 2 * OFFSET, parent_error=error)
+            self.note(
+                "This violates the Liskov substitution principle", context, parent_error=error
+            )
 
     def pretty_callable_or_overload(
         self,

Original file line number	Diff line number	Diff line change
`@@ -1293,6 +1293,9 @@ def signature_incompatible_with_supertype(`
`1293`	`1293`	`)`
`1294`	`1294`	`else:`
`1295`	`1295`	`self.note(override_str, context, offset=ALIGN_OFFSET + 2 * OFFSET, parent_error=error)`
	`1296`	`+ self.note(`
	`1297`	`+ "This violates the Liskov substitution principle", context, parent_error=error`
	`1298`	`+ )`
`1296`	`1299`
`1297`	`1300`	`def pretty_callable_or_overload(`
`1298`	`1301`	`self,`