[plt-scheme] Code for catching exceptions in embedding applications

From: Sergey Khorev (sergey.khorev at gmail.com)
Date: Thu Nov 6 10:12:10 EST 2008

Great thanks and now, I hope, the last question in the series: I
cannot find `exn?' and `exn-message' in the basic environment, i.e.
scheme_lookup_global(scheme_intern_symbol("exn?"), environment)
returns NULL.

I tried to `require' scheme instead of scheme/base but this did not help.

Can you advise what is required for code to work.

    environment = scheme_basic_env();
    exn_p = scheme_lookup_global(scheme_intern_symbol("exn?"), environment);

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