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spec: slightly more realistic example for type assertions

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For #17428.

Change-Id: Ia902b50cf0c40e3c2167fb573a39d328331c38c7
Reviewed-on: https://go-review.googlesource.com/31449
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2016-10-19 09:56:53 -07:00
parent 1e3dc3d5d4
commit 023bb034e9
1 changed files with 9 additions and 6 deletions
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15
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of October 18, 2016",
"Subtitle": "Version of October 19, 2016",
"Path": "/ref/spec"
}-->
@ -3116,13 +3116,16 @@ known to be <code>T</code> in a correct program.
</p>
<pre>
var x interface{} = 7 // x has dynamic type int and value 7
i := x.(int) // i has type int and value 7
var x interface{} = 7 // x has dynamic type int and value 7
i := x.(int) // i has type int and value 7
type I interface { m() }
var y I
s := y.(string) // illegal: string does not implement I (missing method m)
r := y.(io.Reader) // r has type io.Reader and y must implement both I and io.Reader
func f(y I) {
s := y.(string) // illegal: string does not implement I (missing method m)
r := y.(io.Reader) // r has type io.Reader and the dynamic type of y must implement both I and io.Reader
…
}
</pre>
<p>