* data/c.m4 (b4_yy_symbol_print_generate): In yy_symbol_print, accept

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index c494255596bd903e448df631a3834f1555981474..630fdebd118aba45b158e9a2b265da7f01963cc3 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -464,7 +464,8 @@ m4_define_default([b4_yy_symbol_print_generate],
 b4_location_if([, [[const YYLTYPE * const yylocationp], [yylocationp]]])[]dnl
 m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
-  YYUSE (yyvaluep);
+  if (!yyvaluep)
+    return;
 ]b4_location_if([  YYUSE (yylocationp);
 ])dnl
 b4_parse_param_use[]dnl