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spec: add an example of a trivially invalid interface

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In preparation for the forthcoming spec changes for #6977.
While at it, modernize existing File example that dates
back all the way to commit 18c5b488a3.

Change-Id: Id10e4df0513e3de15bd58867222923eefa9473ea
Reviewed-on: https://go-review.googlesource.com/c/go/+/187978
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2019-07-30 16:16:03 -07:00
parent 1ad64fafc8
commit 39d4178735
1 changed files with 16 additions and 8 deletions
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24
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of May 14, 2019",
"Subtitle": "Version of July 31, 2019",
"Path": "/ref/spec"
}-->
@ -1257,11 +1257,19 @@ non-<a href="#Blank_identifier">blank</a> name.
</p>
<pre>
// A simple File interface
// A simple File interface.
interface {
Read(b Buffer) bool
Write(b Buffer) bool
Close()
Read([]byte) (int, error)
Write([]byte) (int, error)
Close() error
}
</pre>
<pre>
interface {
String() string
String() string // illegal: String not unique
_(x int) // illegal: method must have non-blank name
}
</pre>
@ -1272,9 +1280,9 @@ have the method set
</p>
<pre>
func (p T) Read(b Buffer) bool { return … }
func (p T) Write(b Buffer) bool { return … }
func (p T) Close() { … }
func (p T) Read(p []byte) (n int, err error) { return … }
func (p T) Write(p []byte) (n int, err error) { return … }
func (p T) Close() error { return … }
</pre>
<p>