MYDDAS is too closely integreated to be a package.

C/compiler.c

@@ -882,12 +882,13 @@ c_eq(Term t1, Term t2, compiler_struct *cglobs)
     c_var(t1, v, 0, 0, cglobs);
     cglobs->onhead = FALSE;    
   } else {
-    c_var(t1, 0, 0, 0, cglobs);
+    Int v = --cglobs->tmpreg;
+    c_var(t1, v, 0, 0, cglobs);
     cglobs->onhead = TRUE;
     if (IsVarTerm(t2)) {
-      c_var(t2, 0, 0, 0, cglobs);
+      c_var(t2, v, 0, 0, cglobs);
     } else {
-      c_arg(0, t2, 0, 0, cglobs);
+      c_arg(v, t2, 0, 0, cglobs);
     }
     cglobs->onhead = FALSE;
   }