Rollup merge of #117162 - c410-f3r:try, r=workingjubilee

Remove `cfg_match` from the prelude

Fixes #117057

cc #115585

library/core/src/lib.rs

@@ -290,6 +290,9 @@ pub mod assert_matches {
     pub use crate::macros::{assert_matches, debug_assert_matches};
 }
 
+#[unstable(feature = "cfg_match", issue = "115585")]
+pub use crate::macros::cfg_match;
+
 #[macro_use]
 mod internal_macros;