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spec: fix EBNF for slice syntax

The () parentheses grouped wrongly. Removed them completely in
favor of separate 2- and 3-index slice alternatives which is
clearer.

Fixes #14477.

Change-Id: I0b7521ac912130d9ea8740b8793b3b88e2609418
Reviewed-on: https://go-review.googlesource.com/19853
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2016-02-23 10:42:06 -08:00
parent 735e5a483c
commit 5583e8a421

View File

@ -1,6 +1,6 @@
<!--{
"Title": "The Go Programming Language Specification",
"Subtitle": "Version of January 5, 2016",
"Subtitle": "Version of February 23, 2016",
"Path": "/ref/spec"
}-->
@ -2443,9 +2443,8 @@ PrimaryExpr =
Selector = "." identifier .
Index = "[" Expression "]" .
Slice = "[" ( [ Expression ] ":" [ Expression ] ) |
( [ Expression ] ":" Expression ":" Expression )
"]" .
Slice = "[" [ Expression ] ":" [ Expression ] "]" |
"[" [ Expression ] ":" Expression ":" Expression "]" .
TypeAssertion = "." "(" Type ")" .
Arguments = "(" [ ( ExpressionList | Type [ "," ExpressionList ] ) [ "..." ] [ "," ] ] ")" .
</pre>