Doc RAKUDO_EXCEPTIONS_HANDLER

Author: zoffixznet

doc/Programs/00-running.pod6

@@ -90,6 +90,10 @@ Causes the module loader to print debugging information to standard error.
 
 =head2 Error Message Verbosity and Strictness
 
+=defn C<RAKUDO_EXCEPTIONS_HANDLER> (I<Str>; C<src/core/Exception.pm>)
+Specifies the name of a custom exceptions handler. For example, to load and use
+C<Exceptions::JSON> class, set this env var to C<JSON>
+
 =defn C<RAKUDO_NO_DEPRECATIONS> (I<Bool>; C<src/core/Deprecations.pm>)
 If true, suppresses deprecation warnings triggered by the C<is DEPRECATED> trait.