restore feature for stage0

src/librustc/lib.rs

@@ -50,6 +50,7 @@
 #![feature(from_ref)]
 #![feature(fs_read_write)]
 #![cfg_attr(windows, feature(libc))]
+#![cfg_attr(stage0, feature(macro_lifetime_matcher))]
 #![feature(macro_vis_matcher)]
 #![feature(never_type)]
 #![feature(exhaustive_patterns)]

src/librustc_metadata/lib.rs

@@ -15,6 +15,7 @@
 #![feature(box_patterns)]
 #![feature(fs_read_write)]
 #![feature(libc)]
+#![cfg_attr(stage0, feature(macro_lifetime_matcher))]
 #![feature(proc_macro_internals)]
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]

src/librustc_save_analysis/lib.rs

@@ -12,6 +12,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![feature(custom_attribute)]
+#![cfg_attr(stage0, feature(macro_lifetime_matcher))]
 #![allow(unused_attributes)]
 
 #[macro_use]