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go spec: fix error in production syntax

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Fix analoguous error in ebnf.go which already
correctly accepted an empty production.

Fixes #1821.

R=r
CC=golang-dev
https://golang.org/cl/4526056
This commit is contained in:
Robert Griesemer 2011-05-13 12:54:51 -07:00
parent 5236814edd
commit 32b822f29a
2 changed files with 3 additions and 3 deletions
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4
doc/go_spec.html
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@ -1,5 +1,5 @@
<!-- title The Go Programming Language Specification -->
<!-- subtitle Version of May 12, 2011 -->
<!-- subtitle Version of May 13, 2011 -->
<!--
TODO
@ -46,7 +46,7 @@ The syntax is specified using Extended Backus-Naur Form (EBNF):
</p>
<pre class="grammar">
Production = production_name "=" Expression "." .
Production = production_name "=" [ Expression ] "." .
Expression = Alternative { "|" Alternative } .
Alternative = Term { Term } .
Term = production_name | token [ "..." token ] | Group | Option | Repetition .

2
src/pkg/ebnf/ebnf.go
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@ -5,7 +5,7 @@
// Package ebnf is a library for EBNF grammars. The input is text ([]byte)
// satisfying the following grammar (represented itself in EBNF):
//
// Production = name "=" Expression "." .
// Production = name "=" [ Expression ] "." .
// Expression = Alternative { "|" Alternative } .
// Alternative = Term { Term } .
// Term = name | token [ "..." token ] | Group | Option | Repetition .