Function ostree_sys::ostree_repo_set_collection_ref_immediate

pub unsafe extern "C" fn ostree_repo_set_collection_ref_immediate(
    self_: *mut OstreeRepo, 
    ref_: *const OstreeCollectionRef, 
    checksum: *const c_char, 
    cancellable: *mut GCancellable, 
    error: *mut *mut GError
) -> gboolean

This is supported on crate feature v2018_6 only.