Function xmlCtxtSetErrorHandler 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlCtxtSetErrorHandler(
    ctxt: *mut _xmlParserCtxt,
    handler: Option<xmlStructuredErrorFunc>,
    data: *mut c_void,
)

Install a per-context structured error handler.

UPSTREAM-PARITY

void xmlCtxtSetErrorHandler(xmlParserCtxtPtr ctxt,
                            xmlStructuredErrorFunc handler, void *data);