From 472576c6157fc9b9f8758cd3aa93d03af6f7c6e6 Mon Sep 17 00:00:00 2001
From: Rob Pike <r@golang.org>
Date: Tue, 3 Nov 2009 22:38:43 -0800
Subject: [PATCH] make goyacc and units.y work again (minor tweaks). document
 goyacc a little.

R=rsc
CC=go-dev
http://go/go-review/1017024
---
 src/cmd/goyacc/Makefile  |  2 +-
 src/cmd/goyacc/doc.go    | 23 +++++++++++++++++++++++
 src/cmd/goyacc/goyacc.go |  3 ---
 src/cmd/goyacc/units.y   |  1 -
 4 files changed, 24 insertions(+), 5 deletions(-)
 create mode 100644 src/cmd/goyacc/doc.go

diff --git a/src/cmd/goyacc/Makefile b/src/cmd/goyacc/Makefile
index 0fb6198042..80365b86ee 100644
--- a/src/cmd/goyacc/Makefile
+++ b/src/cmd/goyacc/Makefile
@@ -11,7 +11,7 @@ GOFILES=\
 include $(GOROOT)/src/Make.cmd
 
 units: goyacc units.y
-	goyacc units.y
+	./goyacc units.y
 	$(GC) y.go
 	$(LD) -o units y.$O
 
diff --git a/src/cmd/goyacc/doc.go b/src/cmd/goyacc/doc.go
new file mode 100644
index 0000000000..b6a2580f14
--- /dev/null
+++ b/src/cmd/goyacc/doc.go
@@ -0,0 +1,23 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+
+The program goyacc is a version of yacc written in Go and generating
+as output a parser also in Go.
+
+It is largely transliterated from the Inferno version written in Limbo
+which in turn was largely transliterated from the Plan 9 version
+written in C and documented at
+
+	http://plan9.bell-labs.com/magic/man2html/1/yacc
+
+Yacc adepts will have no trouble adapting to this form of the tool.
+
+The file units.y in this directory is a yacc grammar for a version of
+the Unix tool units, also written in Go and largely transliterated
+from the Plan 9 C version.  
+
+*/
+package documentation
diff --git a/src/cmd/goyacc/goyacc.go b/src/cmd/goyacc/goyacc.go
index 3304f31ded..763e61cb03 100644
--- a/src/cmd/goyacc/goyacc.go
+++ b/src/cmd/goyacc/goyacc.go
@@ -47,7 +47,6 @@ package main
 import
 (
 	"flag";
-	"io";
 	"fmt";
 	"bufio";
 	"os";
@@ -1472,8 +1471,6 @@ cpyact(curprod []int, max int)
 func
 openup()
 {
-	var buf string;
-
 	infile = flag.Arg(0);
 	finput = open(infile);
 	if(finput == nil) {
diff --git a/src/cmd/goyacc/units.y b/src/cmd/goyacc/units.y
index a3697a53de..44d1cc7588 100644
--- a/src/cmd/goyacc/units.y
+++ b/src/cmd/goyacc/units.y
@@ -26,7 +26,6 @@ package main
 import
 (
 	"flag";
-	"io";
 	"fmt";
 	"bufio";
 	"os";