Function guile_sys::scm_c_define_gsubr_with_generic

pub unsafe extern "C" fn scm_c_define_gsubr_with_generic(
    name: *const c_char, 
    req: c_int, 
    opt: c_int, 
    rst: c_int, 
    fcn: scm_t_subr, 
    gf: *mut SCM
) -> SCM