rustc-ap-rustc_ast 667.0.0

Automatically published version of the package `rustc_ast` in the rust-lang/rust repository from commit a1528c432e45339d9b5602a19ac3571e2900d37b The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
Documentation 
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fn main() {
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-env-changed=CFG_RELEASE_CHANNEL");
    println!("cargo:rerun-if-env-changed=CFG_DISABLE_UNSTABLE_FEATURES");
}