explain control exceptions

Author: gfldex

doc/Language/exceptions.pod6

@@ -187,6 +187,17 @@ printing a backtrace along with the message:
     die X::WithoutLineNumber.new(payload => "message")
         # prints "message\n" to $*ERR and exits, no backtrace
 
+=head1 Control Exceptions
+
+Control exceptions are thrown by certain L<keywords|/language/phasers#CONTROL>
+and are handled either automatically or by the appropriate
+L<phaser|/language/phasers#Loop_Phasers>. Any unhandled control exception is
+converted to a normal exception.
+
+    { return; CATCH { default { say .^name, ': ',.Str } } }
+    # OUTPUT«X::ControlFlow::Return: Attempt to return outside of any Routine␤»
+    # was CX::Return
+
 =end pod
 
 # vim: expandtab shiftwidth=4 ft=perl6