From 2a5f0c67ca4d5123120885edf85498b5af483956 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Fri, 4 Dec 2009 10:23:12 -0800
Subject: [PATCH] spec: document that built-ins cannot be used as func values

R=gri
CC=golang-dev
https://golang.org/cl/164088
---
 doc/go_spec.html | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/go_spec.html b/doc/go_spec.html
index 2f04de419d8..6c4862e668b 100644
--- a/doc/go_spec.html
+++ b/doc/go_spec.html
@@ -4099,6 +4099,12 @@ They are called like any other function but some of them
 accept a type instead of an expression as the first argument.
 </p>
 
+<p>
+The built-in functions do not have standard Go types,
+so they can only appear in <a href="#Calls">call expressions</a>;
+they cannot be used as function values.
+</p>
+
 <pre class="ebnf">
 BuiltinCall = identifier "(" [ BuiltinArgs ] ")" .
 BuiltinArgs = Type [ "," ExpressionList ] | ExpressionList .