rustc-ap-syntax 449.0.0

Automatically published version of the package `syntax` in the rust-lang/rust repository from commit 0928511d3a11ecc9703c3c34f0fe36282dd9b171 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");
}