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original commit: 4db586cb771db717fbbad95b9206230c73edc858
23 years ago · 9bf08d698a
parent 53140f51b2
commit 9bf08d698a
1 changed files with 2 additions and 0 deletions
--- a/collects/parser-tools/yacc.ss
+++ b/collects/parser-tools/yacc.ss
@ -99,6 +99,8 @@
               (raise-syntax-error #f "missing grammar declaration" stx))
           (if (not end)
               (raise-syntax-error #f "missing end declaration" stx))
+	   (if (not start)
+               (raise-syntax-error #f "missing start declaration" stx))
           (build-parser (if debug debug "")
                         error
                         tokens