If an error or a warning should be emitted when loading an init file, before
the conversion, use texinfo_register_init_loading_error
for an error and
texinfo_register_init_loading_warning
for a warning.
Cause an error message or a warning message based on $message to be output, taking into account options related to error reporting such as --force or --no-warn.
Errors or warning emitted from user defined functions should use the converter (see Error Reporting in User Defined Functions).