rustc-ap-syntax 610.0.0

Automatically published version of the package `syntax` in the rust-lang/rust repository from commit 4b42e919d640f7c714a7e87c91b4f3a9089552d0 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");
}