Rollup merge of rust-lang#139056 - yotamofek:pr/smir/try_fold, r=scottmcm

use `try_fold` instead of `fold`

Small cleanup, applies the [`manual_try_fold`](https://rust-lang.github.io/rust-clippy/master/index.html#manual_try_fold) clippy lint.

Author: matthiaskrgr

Diff for: compiler/stable_mir/src/mir/body.rs

@@ -1057,8 +1057,7 @@ impl Place {
     /// In order to retrieve the correct type, the `locals` argument must match the list of all
     /// locals from the function body where this place originates from.
     pub fn ty(&self, locals: &[LocalDecl]) -> Result<Ty, Error> {
-        let start_ty = locals[self.local].ty;
-        self.projection.iter().fold(Ok(start_ty), |place_ty, elem| elem.ty(place_ty?))
+        self.projection.iter().try_fold(locals[self.local].ty, |place_ty, elem| elem.ty(place_ty))
     }
 }
 

Diff for: compiler/stable_mir/src/mir/visit.rs

@@ -563,7 +563,7 @@ pub struct PlaceRef<'a> {
 impl PlaceRef<'_> {
     /// Get the type of this place.
     pub fn ty(&self, locals: &[LocalDecl]) -> Result<Ty, Error> {
-        self.projection.iter().fold(Ok(locals[self.local].ty), |place_ty, elem| elem.ty(place_ty?))
+        self.projection.iter().try_fold(locals[self.local].ty, |place_ty, elem| elem.ty(place_ty))
     }
 }