Test Trac #10463

was fixed along with Trac #10224

testsuite/tests/partial-sigs/should_compile/T10463.hs

+{-# LANGUAGE ScopedTypeVariables, PartialTypeSignatures #-}
+
+module T10463 where
+
+f (x :: _) = x ++ ""

testsuite/tests/partial-sigs/should_compile/T10463.stderr

+
+T10463.hs:5:9: warning:
+    Found type wildcard ‘_’ standing for ‘[Char]’
+    Relevant bindings include
+      f :: [Char] -> [Char] (bound at T10463.hs:5:1)
+    In a pattern type signature: _
+    In the pattern: x :: _
+    In an equation for ‘f’: f (x :: _) = x ++ ""

testsuite/tests/partial-sigs/should_compile/all.T

@@ -49,3 +49,4 @@ test('WarningWildcardInstantiations', normal, compile, ['-ddump-types'])
 test('T10403', normal, compile, [''])
 test('T10438', normal, compile, [''])
 test('T10519', normal, compile, [''])
+test('T10463', normal, compile, [''])