Rollup merge of #122540 - WaffleLapkin:ununexpected, r=estebank

Do not use `?`-induced skewing of type inference in the compiler

This prevents breakage from #122412 and is generally a good idea.

r? `@estebank`

compiler/rustc_expand/src/lib.rs

@@ -12,6 +12,7 @@
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_span)]
 #![feature(try_blocks)]
+#![feature(yeet_expr)]
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(internal_features)]