diff --git a/parser_test.go b/parser_test.go
index 388b64d..2e6a21d 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -16,7 +16,7 @@ import (
 	"pgregory.net/rapid"
 )
 
-func Todo(t *testing.T) {
+func Todo[T interface{Errorf(string,...any)}](t T) {
 	t.Errorf("TODO")
 }
 
@@ -90,7 +90,7 @@ func TestBind(t *testing.T) {
 	t.Run("returns an error if the second parser returns an error", Todo)
 	t.Run("succeeds if both parsers succeed", rapid.MakeCheck(func(t *rapid.T) {
 		// s := rapid.SliceOfN(rapid.Byte(), 0, 100)
-		t.Errorf("TODO")
+		Todo(t)
 	}))
 	/*
 		If the first parser fails, then consumption depends on the first parser.