Fixes #3031.
R=golang-dev, rsc, r, iant
CC=golang-dev
https://golang.org/cl/
5676054
<!--{
"Title": "The Go Programming Language Specification",
- "Subtitle": "Version of February 14, 2012"
+ "Subtitle": "Version of February 16, 2012"
}-->
<!--
</li>
<li>
- Struct values are comparable if all the fields are comparable.
- Two struct values are equal if their corresponding fields are equal.
+ Struct values are comparable if all their fields are comparable.
+ Two struct values are equal if their corresponding
+ non-<a href="#Blank_identifier">blank</a> fields are equal.
</li>
<li>