File: is-available.rs

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// run-pass

extern crate proc_macro;

// aux-build:is-available.rs
extern crate is_available;

fn main() {
    let a = proc_macro::is_available();
    let b = is_available::from_inside_proc_macro!();
    let c = proc_macro::is_available();
    assert!(!a);
    assert!(b);
    assert!(!c);
}