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spec: clarify nil case in type switches 

The old wording seemed to imply that nil is a kind of type.
Slightly reworded for clarity.

Fixes #21580.

Change-Id: I29898bf0125a10cb8dbb5c7e63ec5399ebc590ca
Reviewed-on: https://go-review.googlesource.com/58490
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
griesemer 2017-08-24 15:05:53 +02:00 committed by Robert Griesemer
parent 770d8d8207
commit 84ac90ebf1
1 changed files with 4 additions and 3 deletions
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7
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of August 14, 2017",
"Subtitle": "Version of August 25, 2017",
"Path": "/ref/spec"
}-->
@ -4820,8 +4820,9 @@ in the TypeSwitchGuard.
</p>
<p>
The type in a case may be <a href="#Predeclared_identifiers"><code>nil</code></a>;
that case is used when the expression in the TypeSwitchGuard
Instead of a type, a case may use the predeclared identifier
<a href="#Predeclared_identifiers"><code>nil</code></a>;
that case is selected when the expression in the TypeSwitchGuard
is a <code>nil</code> interface value.
There may be at most one <code>nil</code> case.
</p>