1 // aux-build:two_macros.rs
3 macro_rules! define_vec {
5 extern crate std as Vec;
13 Vec::panic!(); //~ ERROR `Vec` is ambiguous
17 macro_rules! define_other_core {
19 extern crate std as core;
20 //~^ ERROR macro-expanded `extern crate` items cannot shadow names passed with `--extern`