From 14d2418d2ca10f31c8f3cf510fc954c4b5748faa Mon Sep 17 00:00:00 2001
From: Brandon Dyck <brandon@dyck.us>
Date: Tue, 10 Sep 2024 09:30:54 -0600
Subject: [PATCH] Fix prefix filter

---
 parser_test.go | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/parser_test.go b/parser_test.go
index 441194f..a56ede5 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -14,18 +14,14 @@ func Todo(t *testing.T) {
 	t.Errorf("TODO")
 }
 
-func curry[A, B, C any](f func(A, B) C) func(A) func(B) C {
-	return func(a A) func(B) C {
-		return func(b B) C {
-			return f(a, b)
-		}
-	}
-}
-
 func not[T any](pred func(T) bool) func(T) bool {
 	return func(x T) bool { return !pred(x) }
 }
 
+func hasPrefix(prefix []byte) func([]byte) bool {
+	return func(b []byte) bool { return bytes.HasPrefix(b, prefix) }
+}
+
 func TestSlice(t *testing.T) {
 	assertParseFails := func(t rapid.TB, input []byte, p gigaparsec.Parser[byte, []byte]) (parseErr gigaparsec.ParseError) {
 		t.Helper()
@@ -43,7 +39,7 @@ func TestSlice(t *testing.T) {
 	t.Run("fails with wrong contents", rapid.MakeCheck(func(t *rapid.T) {
 		s := rapid.SliceOfN(rapid.Byte(), 1, -1).Draw(t, "s")
 		input := rapid.SliceOfN(rapid.Byte(), len(s), -1).
-			Filter(not(curry(bytes.HasPrefix)(s))).Draw(t, "input")
+			Filter(not(hasPrefix(s))).Draw(t, "input")
 		assertParseFails(t, input, gigaparsec.Slice(s))
 	}))
 	t.Run("fails at end of input", rapid.MakeCheck(func(t *rapid.T) {