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fix for conversion rule

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R=rsc
DELTA=25  (10 added, 7 deleted, 8 changed)
OCL=30516
CL=30531
This commit is contained in:
Robert Griesemer 2009-06-19 13:03:01 -07:00
parent a6c7a80b5b
commit e2cb60b378
1 changed files with 18 additions and 15 deletions
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33
doc/go_spec.html
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@ -997,7 +997,7 @@ A channel provides a mechanism for two concurrently executing functions
to synchronize execution and communicate by passing a value of a
specified element type. The element type must be complete (§Types).
(TODO: is completeness necessary here?)
A channel value may be <code>nil</code>.
A value of channel type may be <code>nil</code>.
</p>
<pre class="grammar">
@ -1161,19 +1161,22 @@ be assigned to otherwise incompatible types:
</p>
<ul>
<li>
The predeclared constant <code>nil</code> can be assigned to any
pointer, function, slice, map, channel, or interface variable.
<li>
A pointer to an array can be assigned to a slice variable with compatible element type.
The slice variable then refers to the original array; the data is not copied.
</li>
<li>
A value can be assigned to an interface variable if the static
type of the value implements the interface.
</li>
<li>
A value of bidirectional channel type can be assigned to any channel
variable of compatible channel value type.
The predeclared constant <code>nil</code> can be assigned to any
pointer, function, slice, map, channel, or interface variable.
<li>
A pointer <code>p</code> to an array can be assigned to a slice variable
<code>v</code> with compatible element type
if the type of <code>p</code> or <code>v</code> is unnamed.
The slice variable then refers to the original array; the data is not copied.
</li>
<li>
A bidirectional channel <code>c</code> can be assigned to a channel variable
<code>v</code> with compatible channel value type
if the type of <code>c</code> or <code>v</code> is unnamed.
</li>
</ul>
@ -3846,13 +3849,13 @@ The following conversion rules apply:
</p>
<ul>
<li>
1) Between two compatible types (§Type identity and compatibility).
The conversion always succeeds.
1) The conversion succeeds if the value is assignment-compatible
to a variable of type T.
</li>
<li>
2) Between two types that would be compatible if they
or any of their component types were unnamed (§Type identity and compatibility).
The conversion always succeeds.
2) The conversion succeeds if the value would be assignment-compatible
to a variable of type T if the value type or T or any of their component
types are unnamed (§Type identity and compatibility).
</li>
<li>
3) Between integer types. If the value is a signed quantity, it is