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spec: disallow recursive embedded interfaces

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Fixes #1814.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5647054
This commit is contained in:
Russ Cox 2012-02-08 14:35:00 -05:00
parent fd2a511253
commit 388816ae07
1 changed files with 23 additions and 2 deletions
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25
doc/go_spec.html
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@ -1120,9 +1120,10 @@ they implement the <code>Lock</code> interface as well
as the <code>File</code> interface.
</p>
<p>
An interface may contain an interface type name <code>T</code>
An interface may use an interface type name <code>T</code>
in place of a method specification.
The effect is equivalent to enumerating the methods of <code>T</code> explicitly
The effect, called embedding an interface,
is equivalent to enumerating the methods of <code>T</code> explicitly
in the interface.
</p>
@ -1139,6 +1140,26 @@ type File interface {
}
</pre>
<p>
An interface definition for type <code>T</code> may not embed itself,
nor any interface type that embeds <code>T</code> directly or indirectly.
</p>
<pre>
// illegal: Bad cannot embed itself
type Bad interface {
Bad
}
// illegal: Bad1 cannot embed itself using Bad2
type Bad1 interface {
Bad2
}
type Bad2 interface {
Bad1
}
</pre>
<h3 id="Map_types">Map types</h3>
<p>