Auto merge of #44008 - RalfJung:staged1, r=alexcrichton

Make sure crates not opting in to staged_api don't use staged_api

This also fixes the problem that with `-Zforce-unstable-if-unmarked` set, crates could not use `#[deprecated]`.

If you prefer, I can instead submit another version which just fixes this problem, but still allows the staged API attributes for all crates when  `-Zforce-unstable-if-unmarked` is set. I have prepared that at <https://github.com/RalfJung/rust/tree/staged2>. As yet another alternative, @alexcrichton suggested to turn this error into a lint, but that seems to be much more work, so is it worth it?

Cc @alexcrichton #43975

1 files changed, 1 insertions, 0 deletions

diff --git a/src/librustc_plugin/lib.rs b/src/librustc_plugin/lib.rs
index 1020cec9a86..602b71dca05 100644
--- a/src/librustc_plugin/lib.rs
+++ b/src/librustc_plugin/lib.rs
@@ -69,6 +69,7 @@
 #![deny(warnings)]
 
 #![feature(rustc_diagnostic_macros)]
+#![feature(staged_api)]
 
 #[macro_use] extern crate syntax;