rustc-ap-syntax 368.0.0

Automatically published version of the package `syntax` in the rust-lang/rust repository from commit d1731801163df1d3a8d4ddfa68adac2ec833ef7f The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
Documentation
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");
}