doc: document "range-over-func" language change in release notes
For #65614.
Change-Id: Idbbcb6eb57b7294d52b174c1aba74ca7aa1b8efd
Reviewed-on: https://go-review.googlesource.com/c/go/+/590616
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Bypass: Robert Griesemer <gri@google.com>
diff --git a/doc/next/2-language.md b/doc/next/2-language.md
index 61030bd..e45874b 100644
--- a/doc/next/2-language.md
+++ b/doc/next/2-language.md
@@ -1,3 +1,13 @@
## Changes to the language {#language}
+<!-- go.dev/issue/61405, CL 557835, CL 584596 -->
+Go 1.23 makes the (Go 1.22) ["range-over-func" experiment](https://tip.golang.org/wiki/RangefuncExperiment) a part of the language.
+The "range" clause in a "for-range" loop now accepts iterator functions of the following types
+ func(func() bool)
+ func(func(K) bool)
+ func(func(K, V) bool)
+
+ as range expressions.
+ Calls of the iterator argument function produce the iteration values for the "for-range" loop.
+ For details see the [language spec](https://tip.golang.org/ref/spec#For_statements).
