rust/tests/ui/proc-macro/env.rs

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//@ aux-build:env.rs
//@ run-pass
//@ rustc-env: THE_CONST=1
//@ compile-flags: -Zunstable-options --env-set THE_CONST=12 --env-set ANOTHER=4
#![crate_name = "foo"]
extern crate env;
use env::generate_const;
generate_const!();
fn main() {
assert_eq!(THE_CONST, 12);
assert_eq!(ANOTHER, 1);
}