Function cmark_gfm_sys::cmark_node_set_on_enter

pub unsafe extern "C" fn cmark_node_set_on_enter(
    node: *mut cmark_node, 
    on_enter: *const c_char
) -> c_int

Sets the literal text to render "on enter" for a custom 'node'. Any children of the node will be rendered after this text. Returns 1 on success 0 on failure.