> 
> Hello, I've replicated this mysterious behaviour in a small, simple
> example. Interestingly, the problem pops up for values with Custom_tag,
> but not for unboxed, String_tag, or whatever bools are:

You found a bug in the "ocamlc -output-obj" machinery.  The trivial patch
below (for file byterun/startup.c) fixes it.

- Xavier Leroy

--- startup.c   2002/09/03 13:56:36     1.55
+++ startup.c   2003/06/01 15:57:34
@@ -420,6 +420,7 @@
   value res;
 
   init_ieee_floats();
+  init_custom_operations();
 #ifdef DEBUG
   verb_gc = 63;
 #endif

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