diff --git a/libnixf/src/Basic/diagnostic.py b/libnixf/src/Basic/diagnostic.py
index c55e11795..8261d8548 100644
--- a/libnixf/src/Basic/diagnostic.py
+++ b/libnixf/src/Basic/diagnostic.py
@@ -198,14 +198,14 @@ class Diagnostic(TypedDict):
     {
         "sname": "sema-unused-def-lambda-witharg-formal",
         "cname": "UnusedDefLambdaWithArg_Formal",
-        "severity": "Warning",
-        "message": "argument `{}` in `@`-pattern is not used",
+        "severity": "Hint",
+        "message": "attribute `{}` of `@`-pattern argument is not used, but may be referenced from the argument",
     },
     {
         "sname": "sema-unused-def-lambda-witharg-arg",
         "cname": "UnusedDefLambdaWithArg_Arg",
-        "severity": "Hint",
-        "message": "attribute `{}` of `@`-pattern argument is not used, but may be referenced from the argument",
+        "severity": "Warning",
+        "message": "argument `{}` in `@`-pattern is not used",
     },
     {
         "sname": "sema-extra-rec",