Test that unconfigured macro-expanded macro definitions are not invokable,

test that unconfigured macro-expanded macro invocations are not expanded, and
test that feature gated cfg variables on macro-expanded macro definitions are errors.

Author: jseyfried

src/test/compile-fail/expanded-cfg.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(custom_attribute, rustc_attrs)]
+#![feature(custom_attribute)]
 
 macro_rules! mac {
     {} => {
@@ -19,11 +19,18 @@ macro_rules! mac {
 
             #[cfg_attr(target_thread_local, custom)]
             fn g() {}
+
+            unconfigured_invocation!();
         }
+
+        #[cfg(target_thread_local)] //~ ERROR experimental and subject to change
+        macro_rules! foo { () => {} }
+
+        #[cfg(attr)]
+        macro_rules! foo { () => { compile error } }
+
+        foo!();
     }
 }
 
 mac! {}
-
-#[rustc_error]
-fn main() {} //~ ERROR compilation successful