rust/src/test/ui/proc-macro/meta-macro-hygiene.rs

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// aux-build:make-macro.rs
// aux-build:meta-macro.rs
// edition:2018
// compile-flags: -Z span-debug -Z macro-backtrace -Z unpretty=expanded,hygiene
// check-pass
// normalize-stdout-test "\d+#" -> "0#"
//
// We don't care about symbol ids, so we set them all to 0
// in the stdout
#![no_std] // Don't load unnecessary hygiene information from std
extern crate std;
extern crate meta_macro;
macro_rules! produce_it {
() => {
// `print_def_site!` will respan the `$crate` identifier
// with `Span::def_site()`. This should cause it to resolve
// relative to `meta_macro`, *not* `make_macro` (despite
// the fact that that `print_def_site` is produced by
// a `macro_rules!` macro in `make_macro`).
meta_macro::print_def_site!($crate::dummy!());
}
}
fn main() {
produce_it!();
}