Function emacs_module_bindings::hlapi::register

pub fn register(
    env: *mut EmacsEnv, 
    elisp_sym: &str, 
    native_sym: EmacsSubr, 
    nargs_range: Range<usize>, 
    docstring: &str
) -> ConvResult<EmacsVal>

Register an Emacs subr, so that it can be accessed from Elisp.