Rollup merge of #52248 - ljedrz:dyn_librustc_allocator, r=oli-obk

Deny bare trait objects in in src/librustc_allocator

Enforce `#![deny(bare_trait_objects)]` in `src/librustc_allocator`.

src/librustc_allocator/expand.rs

@@ -37,7 +37,7 @@
 
 pub fn modify(
     sess: &ParseSess,
-    resolver: &mut Resolver,
+    resolver: &mut dyn Resolver,
     krate: Crate,
     crate_name: String,
     handler: &rustc_errors::Handler,
@@ -56,7 +56,7 @@ struct ExpandAllocatorDirectives<'a> {
     found: bool,
     handler: &'a rustc_errors::Handler,
     sess: &'a ParseSess,
-    resolver: &'a mut Resolver,
+    resolver: &'a mut dyn Resolver,
     crate_name: Option<String>,
 
     // For now, we disallow `global_allocator` in submodules because hygiene is hard. Keep track of
@@ -256,7 +256,7 @@ fn arg_ty(
         &self,
         ty: &AllocatorTy,
         args: &mut Vec<Arg>,
-        ident: &mut FnMut() -> Ident,
+        ident: &mut dyn FnMut() -> Ident,
     ) -> P<Expr> {
         match *ty {
             AllocatorTy::Layout => {

src/librustc_allocator/lib.rs

@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![deny(bare_trait_objects)]
 #![feature(rustc_private)]
 
 #[macro_use] extern crate log;