//@ aux-build:bang_proc_macro2.rs extern crate bang_proc_macro2; use bang_proc_macro2::bang_proc_macro2; fn main() { let foobar = 42; bang_proc_macro2!(); //~^ ERROR cannot find value `foobar2` in this scope //~| HELP a local variable with a similar name exists //~| SUGGESTION foobar println!("{}", x); }