Use do yeet () and do yeet _ instead of None? and Err(_)? in compiler

This prevents breakage when `?` no longer skews inference.

Author: WaffleLapkin

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.

compiler/rustc_infer/src/infer/error_reporting/need_type_info.rs

@@ -990,7 +990,7 @@ impl<'a, 'tcx> FindInferSourceVisitor<'a, 'tcx> {
             let generics_def_id = tcx.res_generics_def_id(path.res)?;
             let generics = tcx.generics_of(generics_def_id);
             if generics.has_impl_trait() {
-                None?;
+                do yeet ();
             }
             let insert_span =
                 path.segments.last().unwrap().ident.span.shrink_to_hi().with_hi(path.span.hi());
@@ -1044,7 +1044,7 @@ impl<'a, 'tcx> FindInferSourceVisitor<'a, 'tcx> {
                 let generics = tcx.generics_of(def_id);
                 let segment: Option<_> = try {
                     if !segment.infer_args || generics.has_impl_trait() {
-                        None?;
+                        do yeet ();
                     }
                     let span = tcx.hir().span(segment.hir_id);
                     let insert_span = segment.ident.span.shrink_to_hi().with_hi(span.hi());

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]