head-pos.log ( failed)

test link: tests/head/head-pos.sh
FAIL: tests/head/head-pos
=========================

--- exp	2025-02-28 06:35:49.884511513 +0000
+++ out	2025-02-28 06:35:49.884511513 +0000
@@ -1 +0,0 @@
-b
--- exp	2025-02-28 06:35:49.884511513 +0000
+++ out	2025-02-28 06:35:49.890511598 +0000
@@ -1 +0,0 @@
-b
--- exp-n	2025-02-28 06:35:50.060514028 +0000
+++ n	2025-02-28 06:35:50.088514428 +0000
@@ -1 +1 @@
-50000
+0
FAIL tests/head/head-pos.sh (exit status: 1)