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spec: &x panics if x does

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See golang.org/s/go12nil for the extended version.

R=golang-dev, r, adonovan
CC=golang-dev
https://golang.org/cl/12964043
This commit is contained in:
Russ Cox 2013-08-15 14:33:26 -04:00
parent 08fdf00906
commit 5ce78b7cd2
1 changed files with 7 additions and 0 deletions
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7
doc/go_spec.html
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@ -3287,7 +3287,10 @@ or an array indexing operation of an addressable array.
As an exception to the addressability requirement, <code>x</code> may also be a
(possibly parenthesized)
<a href="#Composite_literals">composite literal</a>.
If the evaluation of <code>x</code> would cause a <a href="#Run_time_panics">run-time panic</a>,
then the evaluation of <code>&x</code> does too.
</p>
<p>
For an operand <code>x</code> of pointer type <code>*T</code>, the pointer
indirection <code>*x</code> denotes the value of type <code>T</code> pointed
@ -3302,6 +3305,10 @@ will cause a <a href="#Run_time_panics">run-time panic</a>.
&amp;Point{2, 3}
*p
*pf(x)
var x *int = nil
*x // causes a run-time panic
&*x // causes a run-time panic
</pre>