> The old code is certainly wrong.  It marks variables on LHS before
> checking the RHS for defined.  I would much rather work out what is wrong
> with the null pointer.

I get a fix (SUCCESS 8723, FAIL 0) with this patch

diff -ur csound5~/Engine/csound_orc_compile.c csound5/Engine/csound_orc_compile.c
--- csound5~/Engine/csound_orc_compile.c	2012-05-07 16:11:59.000000000 +0200
+++ csound5/Engine/csound_orc_compile.c	2012-05-07 16:12:34.000000000 +0200
@@ -489,9 +489,9 @@
           }
           /* VL 14/12/11 : calling lgbuild here seems to be problematic for
              undef arg checks */
-          /* else { */
-          /*   lgbuild(csound, arg, 1); */
-          /* } */
+          else {
+            lgbuild(csound, arg, 1);
+          }
 
 
         }
@@ -510,7 +510,6 @@
         //        csound->Message(csound, "Opcode InTypes: %s\n", ep->intypes);
         //        csound->Message(csound, "Opcode OutTypes: %s\n", ep->outypes);
 
-        set_xincod(csound, tp, ep, root->line);
         /* OUTARGS */
         for (outargs = root->left; outargs != NULL; outargs = outargs->next) {
 
@@ -533,6 +532,7 @@
           }
 
         }
+        set_xincod(csound, tp, ep, root->line);
         set_xoutcod(csound, tp, ep, root->line);
 
         if (root->right != NULL) {

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