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

From-SVN: r1987

(chainon): Check for op2 being the last elt of the chain.
From-SVN: r1987
f47ee9f2 · Richard Stallman · f786509d · f47ee9f2
Commit f47ee9f2 authored Aug 29, 1992 by Richard Stallman
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gcc/tree.c
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--- 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;
    }