net/http: add comments that servemux121.go should remain frozen

Change-Id: I6d1e02ffd07dbb722669abb2e72784dcb2bfffd0
GitHub-Last-Rev: 55a82f724a32237be059ae0696cf023db414f1d0
GitHub-Pull-Request: golang/go#66848
Reviewed-on: https://go-review.googlesource.com/c/go/+/579118
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Cherry Mui <cherryyz@google.com>
Reviewed-by: Damien Neil <dneil@google.com>

diff --git a/src/net/http/servemux121.go b/src/net/http/servemux121.go
index c0a4b7701056095806f7582f0ad87331606f4f2b..923a28fb440685c6bf376798ed31d4b20a949e9e 100644 (file)
--- a/src/net/http/servemux121.go
+++ b/src/net/http/servemux121.go
@@ -10,6 +10,10 @@ package http
 // Changes are minimal: aside from the different receiver type,
 // they mostly involve renaming functions, usually by unexporting them.
 
+// servemux121.go exists solely to provide a snapshot of
+// the pre-Go 1.22 ServeMux implementation for backwards compatibility.
+// Do not modify this file, it should remain frozen.
+
 import (
        "internal/godebug"
        "net/url"