(chainon): Check for op2 being the last elt of the chain.

From-SVN: r1987

diff --git a/gcc/tree.c b/gcc/tree.c
index c22f3b8aa05f8df7ba3da82f16757bc030528230..8f03250b6a71148e4e2d3c8c47728ec921f9a3b7 100644 (file)
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -1490,6 +1490,7 @@ chainon (op1, op2)
     {
       for (t = op1; TREE_CHAIN (t); t = TREE_CHAIN (t))
        if (t == op2) abort (); /* Circularity being created */
+      if (t == op2) abort ();  /* Circularity being created */
       TREE_CHAIN (t) = op2;
       return op1;
     }