Where is lwt_unix_not_available defined in the Lwt package

Learning
1

I am experimenting with the source code of the Lwt package. Right now I am stuck because of the C function called lwt_unix_not_available and declared in lwt_unix.h :

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The relevant excerpt from lwt_unix.h is

/* Raise [Lwt_unix.Not_available]. */
void lwt_unix_not_available(char const *feature) Noreturn;

So, that function never returns anything to its caller (that makes sense because it raises an exception).
The error message I get in the OCaml toplevel seems to indicate that I failed to load/include a c implementation file where lwt_unix_not_available is defined. But a grep search for lwt_unix_not_available source directory failed to locate any such file.

2

It’s here.

You may have misread the grep output, or there is some problem with your source tree. grep found it on my machine.

3

It’s there indeed. My source tree was from my old opam switch and out of date. Thanks for taking the time to answer my stupid question. I also have another newbie question here if you have the patience