fn: fix UnwrapOrFail semantics

fn/result_test.go

@@ -0,0 +1,11 @@
+package fn
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestResultUnwrapOrFail(t *testing.T) {
+	require.Equal(t, Ok(1).UnwrapOrFail(t), 1)
+}