CFI: Fix fn items, closures, and Fn trait objects

compiler/rustc_middle/src/ty/context.rs

@@ -1841,7 +1841,7 @@ impl<'tcx> TyCtxt<'tcx> {
     /// does not compute the full elaborated super-predicates but just the set of def-ids. It is used
     /// to identify which traits may define a given associated type to help avoid cycle errors.
     /// Returns a `DefId` iterator.
-    fn super_traits_of(self, trait_def_id: DefId) -> impl Iterator<Item = DefId> + 'tcx {
+    pub fn super_traits_of(self, trait_def_id: DefId) -> impl Iterator<Item = DefId> + 'tcx {
         let mut set = FxHashSet::default();
         let mut stack = vec![trait_def_id];
 

compiler/rustc_middle/src/ty/sty.rs

@@ -1836,6 +1836,11 @@ impl<'tcx> Ty<'tcx> {
         self.0.0.flags
     }
 
+    #[inline]
+    pub fn is_tuple(self) -> bool {
+        matches!(self.kind(), Tuple(..))
+    }
+
     #[inline]
     pub fn is_unit(self) -> bool {
         match self.kind() {
@@ -2208,6 +2213,11 @@ impl<'tcx> Ty<'tcx> {
         matches!(self.kind(), FnDef(..) | FnPtr(_))
     }
 
+    #[inline]
+    pub fn is_fn_def(self) -> bool {
+        matches!(self.kind(), FnDef(..))
+    }
+
     #[inline]
     pub fn is_fn_ptr(self) -> bool {
         matches!(self.kind(), FnPtr(_))

compiler/rustc_symbol_mangling/src/lib.rs

@@ -92,6 +92,7 @@
 #![feature(rustdoc_internals)]
 #![feature(let_chains)]
 #![allow(internal_features)]
+#![feature(iter_order_by)]
 
 #[macro_use]
 extern crate rustc_middle;