Dear Camllists,

I'm having trouble using Marshal.to_string.  My call looks like this:

  Marshal.to_string f [Marshal.Closures]

but unfortunately Marshal.to_string raises an exception:

  Fatal error: exception Invalid_argument("output_value: abstract value (Custom)")

Unfortunately I can't find any discussion of this possibility in the manual.
Can anybody on the list explain what the problem is and how I might work
around it?


Norman