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-rwxr-xr-xtool/ytab.sed1
1 files changed, 1 insertions, 0 deletions
diff --git a/tool/ytab.sed b/tool/ytab.sed
index 706cf75a9a..a9599ce0ed 100755
--- a/tool/ytab.sed
+++ b/tool/ytab.sed
@@ -1,4 +1,5 @@
#!/bin/sed -f
+# This file is used when generating code for the Ruby parser.
/^int yydebug;/{
i\
#ifndef yydebug