Use of deprecated item not propagated to macro expansion

[laumann]

When the spawn function was deprecated in favour of std::thread::Thread::spawn, the following program will produce a warning

fn main() {
    spawn(move|| ());
}

Output:

<anon>:11:5: 11:10 warning: use of deprecated item: use std::thread::Thread::spawn and detach instead, #[warn(deprecated)] on by default
<anon>:11     spawn(move|| ());
              ^~~~~

But if the same call is wrapped in a macro the warning is not emitted, as follows:

#![feature(macro_rules)]
// Short-hand macro for spawn(move|| expr)
macro_rules! go( ($e:expr) => (spawn(move|| $e)) );

fn main() {
    go!{ () };
}

Here it is on the playpen

Not sure if this is a bug or not, or if the warning should be emitted, but I would have expected the same warning when the macro is "unwrapped".

[alexcrichton]

cc #12122

[laumann]

@alexcrichton That indeed appears to be the same issue - should this one be closed then?

[alexcrichton]

It's not quite the same because the feature gating code is separate from the stability level code, and #12122 is specifically about feature gates where this is specifically about stability levels.