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go spec: clarify rules for append, scope rules for :=

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Fixes #1936.
Fixes #1940.

R=rsc, r, iant, ken, iant
CC=golang-dev
https://golang.org/cl/4585049
This commit is contained in:
Robert Griesemer 2011-06-12 12:09:50 -07:00
parent 27cbf06d50
commit 95b8137a16
1 changed files with 8 additions and 5 deletions
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13
doc/go_spec.html
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@ -1,5 +1,5 @@
<!-- title The Go Programming Language Specification --> <!-- title The Go Programming Language Specification -->
<!-- subtitle Version of June 7, 2011 --> <!-- subtitle Version of June 10, 2011 -->
<!-- <!--
TODO TODO
@ -10,7 +10,6 @@ TODO
[ ] clarify what a field name is in struct declarations [ ] clarify what a field name is in struct declarations
(struct{T} vs struct {T T} vs struct {t T}) (struct{T} vs struct {T T} vs struct {t T})
[ ] need explicit language about the result type of operations [ ] need explicit language about the result type of operations
[ ] should string(1<<s) and float32(1<<s) be valid?
[ ] should probably write something about evaluation order of statements even [ ] should probably write something about evaluation order of statements even
though obvious though obvious
[ ] review language on implicit dereferencing [ ] review language on implicit dereferencing
@ -1452,6 +1451,7 @@ Go is lexically scoped using blocks:
<li>The scope of a constant or variable identifier declared <li>The scope of a constant or variable identifier declared
inside a function begins at the end of the ConstSpec or VarSpec inside a function begins at the end of the ConstSpec or VarSpec
(ShortVarDecl for short variable declarations)
and ends at the end of the innermost containing block.</li> and ends at the end of the innermost containing block.</li>
<li>The scope of a type identifier declared inside a function <li>The scope of a type identifier declared inside a function
@ -4590,11 +4590,14 @@ Two built-in functions assist in common slice operations.
</p> </p>
<p> <p>
The function <code>append</code> appends zero or more values <code>x</code> The <a href="#Function_types">variadic</a> function <code>append</code>
appends zero or more values <code>x</code>
to <code>s</code> of type <code>S</code>, which must be a slice type, and to <code>s</code> of type <code>S</code>, which must be a slice type, and
returns the resulting slice, also of type <code>S</code>. returns the resulting slice, also of type <code>S</code>.
Each value <code>x</code> must be <a href="#Assignability">assignable</a> to The values <code>x</code> are passed to a parameter of type <code>...T</code>
the <a href="#Slice_types">element type</a> of <code>S</code>. where <code>T</code> is the <a href="#Slice_types">element type</a> of
<code>S</code> and the respective
<a href="#Passing_arguments_to_..._parameters">parameter passing rules</a> apply.
</p> </p>
<pre class="grammar"> <pre class="grammar">