rustc-ap-syntax 399.0.0

Automatically published version of the package `syntax` in the rust-lang/rust repository from commit f22dca0a1bef4141e75326caacc3cd59f3d5be8e 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");
}