const-ify some tables

matches found with

	% grep -R '=[	 ]*{' . | fgrep -v const

1 files changed, 1 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index 47fd2c6..a71291a 100644
--- a/parse.y
+++ b/parse.y
@@ -500,7 +500,7 @@ optsemicolon	: ';'
 
 %%
 
-static struct keyword {
+static const struct keyword {
 	const char *word;
 	int token;
 } keywords[] = {