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)]
 

compiler/rustc_expand/src/module.rs

@@ -62,7 +62,7 @@ pub(crate) fn parse_external_mod(
 
         // Ensure file paths are acyclic.
         if let Some(pos) = module.file_path_stack.iter().position(|p| p == &mp.file_path) {
-            Err(ModError::CircularInclusion(module.file_path_stack[pos..].to_vec()))?;
+            do yeet ModError::CircularInclusion(module.file_path_stack[pos..].to_vec());
         }
 
         // Actually parse the external file as a module.