container/stub: remove function call in handleExit

This gets inlined and does not cause problems usually but turns out -coverpkg uninlines it and breaks the recovery.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/stub/exit.go

@@ -12,20 +12,13 @@ const (
 )
 
 // HandleExit must be deferred before calling with the stub.
-func (s *Stub[K]) HandleExit() { handleExit(s.TB, true) }
-
-func handleExit(t testing.TB, root bool) {
+func HandleExit(t testing.TB) {
 	switch r := recover(); r {
 	case PanicExit:
 		break
 
 	case panicFailNow:
-		if root {
-			t.FailNow()
-		} else {
-			t.Fail()
-		}
-		break
+		t.FailNow()
 
 	case panicFatal, panicFatalf, nil:
 		break
@@ -34,3 +27,18 @@ func handleExit(t testing.TB, root bool) {
 		panic(r)
 	}
 }
+
+// handleExitNew handles exits from goroutines created by [Stub.New].
+func handleExitNew(t testing.TB) {
+	switch r := recover(); r {
+	case PanicExit, panicFatal, panicFatalf, nil:
+		break
+
+	case panicFailNow:
+		t.Fail()
+		break
+
+	default:
+		panic(r)
+	}
+}