| //@ revisions: ed2015 ed2021 | 
 | //@[ed2015] edition: 2015 | 
 | //@[ed2021] edition: 2021 | 
 | pub use _::{a, b}; | 
 | //~^ ERROR expected identifier, found reserved identifier `_` | 
 | pub use std::{a, _}; | 
 | //~^ ERROR expected identifier, found reserved identifier `_` | 
 | //~| ERROR unresolved import `std::a` | 
 | pub use std::{b, _, c}; | 
 | //~^ ERROR expected identifier, found reserved identifier `_` | 
 | //~| ERROR unresolved imports `std::b`, `std::c` | 
 | pub use std::{_, d}; | 
 | //~^ ERROR expected identifier, found reserved identifier `_` | 
 | //~| ERROR unresolved import `std::d` | 
 |  | 
 | fn main() {} |