Add a regression test for #14548

testsuite/tests/rename/should_fail/T14548.hs

+{-# LANGUAGE ScopedTypeVariables, TypeApplications, PolyKinds #-}
+
+module T14548 where
+
+data Prox (a :: k) = MkProx
+
+-- fail
+f :: forall a. Prox (a :: k)
+f = MkProx @k @a
+
+-- fail
+g :: forall (a :: k). Prox (a :: k)
+g = MkProx @k @a
+
+-- ok
+h :: forall k (a :: k). Prox (a :: k)
+h = MkProx @k @a

testsuite/tests/rename/should_fail/T14548.stderr

+
+T14548.hs:8:27: error: Not in scope: type variable ‘k’
+
+T14548.hs:9:13: error: Not in scope: type variable ‘k’
+
+T14548.hs:12:19: error: Not in scope: type variable ‘k’
+
+T14548.hs:12:34: error: Not in scope: type variable ‘k’
+
+T14548.hs:13:13: error: Not in scope: type variable ‘k’

testsuite/tests/rename/should_fail/all.T

@@ -149,3 +149,4 @@ test('ExplicitForAllRules2', normal, compile_fail, [''])
 test('T15957_Fail', normal, compile_fail, ['-Werror -Wall -Wno-missing-signatures'])
 test('T16385', normal, compile_fail, [''])
 test('T16504', normal, compile_fail, [''])
+test('T14548', normal, compile_fail, [''])