| // edition:2018 | |
| // Tests that arbitrary crates (other than `core`, `std` and `meta`) | |
| // aren't allowed without `--extern`, even if they're in the sysroot. | |
| use alloc; //~ ERROR unresolved import `alloc` | |
| use test; // OK, imports the built-in attribute macro `#[test]`, but not the `test` crate. | |
| use proc_macro; // OK, imports the built-in `proc_macro` attribute, but not the `proc_macro` crate. | |
| fn main() {} |