From 9ef2c797644b195391dd24c82f7121e52345dc36 Mon Sep 17 00:00:00 2001
From: Polister <151947504+ZPolister@users.noreply.github.com>
Date: Mon, 11 Aug 2025 00:38:52 +0800
Subject: [PATCH] =?UTF-8?q?docs(nil):=20=E7=BB=86=E5=8C=96=E7=A4=BA?=
 =?UTF-8?q?=E4=BE=8B=E7=9A=84=E6=AD=A7=E4=B9=89=EF=BC=8C=E4=BF=AE=E6=AD=A3?=
 =?UTF-8?q?=E7=A4=BA=E4=BE=8B=E4=BB=A3=E7=A0=81=E7=BC=A9=E8=BF=9B?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 src/essential/impl/err/3.nil.md | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/essential/impl/err/3.nil.md b/src/essential/impl/err/3.nil.md
index f67fe7bbc..8ba8352b9 100644
--- a/src/essential/impl/err/3.nil.md
+++ b/src/essential/impl/err/3.nil.md
@@ -8,7 +8,7 @@
 type A struct {
   b B
   c C
-     d D
+  d D
 }
 
 func (a A) Close() error {
@@ -197,7 +197,7 @@ func main() {
 }
 ```
 
-当 map 为`nil`的时候，还可以对其进行访问
+当 map 为`nil`的时候，还可以对其进行访问，但`nil`的 map 是只读的，一旦尝试写入就会引发panic
 
 ```go
 func main() {
@@ -205,6 +205,10 @@ func main() {
   i, ok := s[""]
   fmt.Println(i, ok)
   fmt.Println(len(s))
+
+  // 尝试写入时，会引发panic
+  s["a"] = 1 // panic: assignment to entry in nil map
+
 }
 ```