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spec: document that built-ins cannot be used as func values

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R=gri
CC=golang-dev
https://golang.org/cl/164088
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Russ Cox 2009-12-04 10:23:12 -08:00
parent 609eeee817
commit 2a5f0c67ca
1 changed files with 6 additions and 0 deletions
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doc/go_spec.html
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@ -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 .