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spec: Allow omission of low slice bound

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See also https://golang.org/cl/1957045/

R=gri, rsc, r
CC=golang-dev
https://golang.org/cl/2163042
This commit is contained in:
Scott Lawrence 2010-09-07 14:30:17 -07:00 committed by Robert Griesemer
parent e50611d235
commit 0c1695b42e
1 changed files with 10 additions and 7 deletions
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17
doc/go_spec.html
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@ -2183,7 +2183,7 @@ PrimaryExpr =
Selector = "." identifier .
Index = "[" Expression "]" .
Slice = "[" Expression ":" [ Expression ] "]" .
Slice = "[" [ Expression ] ":" [ Expression ] "]" .
TypeAssertion = "." "(" Type ")" .
Call = "(" [ ExpressionList [ "," ] ] ")" .
</pre>
@ -2453,12 +2453,15 @@ s[2] == 4
</pre>
<p>
For convenience, the <code>hi</code> expression may be omitted; the notation
<code>a[lo :]</code> is shorthand for <code>a[lo : len(a)]</code>.
For arrays or strings, the indexes
<code>lo</code> and <code>hi</code> must satisfy
0 &lt;= <code>lo</code> &lt;= <code>hi</code> &lt;= length;
for slices, the upper bound is the capacity rather than the length.
For convenience, any of the index expressions may be omitted. A missing low
index defaults to zero; a missing high index defaults to the length of the
array, slice, or string.
</p>
<p>
For arrays or strings, the indexes <code>low</code> and <code>high</code> must
satisfy 0 &lt;= <code>low</code> &lt;= <code>high</code> &lt;= length; for
slices, the upper bound is the capacity rather than the length.
</p>
<p>