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_infer/src/lib.rs

@@ -27,6 +27,7 @@
 #![feature(iterator_try_collect)]
 #![cfg_attr(bootstrap, feature(min_specialization))]
 #![feature(try_blocks)]
+#![feature(yeet_expr)]
 #![recursion_limit = "512"] // For rustdoc
 
 #[macro_use]