Function mupdf_sys::fz_default_error_callback

pub unsafe extern "C" fn fz_default_error_callback(
    user: *mut c_void,
    message: *const c_char
)

FIXME: Better not to expose fz_default_error_callback, and fz_default_warning callback and to allow ‘NULL’ to be used int fz_set_xxxx_callback to mean “defaults”.

FIXME: Do we need/want functions like fz_error_callback(ctx, message) to allow callers to inject stuff into the error/warning streams? / /** The default error callback. Declared publicly just so that the error callback can be set back to this after it has been overridden.