1 files changed, 4 insertions, 0 deletions
diff --git a/srcpos.h b/srcpos.h
index 1c74efd..8dc118f 100644
--- a/srcpos.h
+++ b/srcpos.h
@@ -74,6 +74,7 @@ struct srcpos {
     int last_line;
     int last_column;
     struct srcfile_state *file;
+    struct srcpos *next;
 };
 
 #define YYLTYPE struct srcpos
@@ -93,11 +94,14 @@ struct srcpos {
 				YYRHSLOC(Rhs, 0).last_column;			\
 			(Current).file = YYRHSLOC (Rhs, 0).file;		\
 		}								\
+		(Current).next = NULL;						\
 	} while (0)
 
 
 extern void srcpos_update(struct srcpos *pos, const char *text, int len);
 extern struct srcpos *srcpos_copy(struct srcpos *pos);
+extern struct srcpos *srcpos_extend(struct srcpos *new_srcpos,
+				    struct srcpos *old_srcpos);
 extern char *srcpos_string(struct srcpos *pos);
 
 extern void PRINTF(3, 0) srcpos_verror(struct srcpos *pos, const char *prefix,