review comments

src/librustc_typeck/check/coercion.rs

@@ -821,11 +821,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         let (adjustments, _) = self.register_infer_ok_obligations(ok);
         self.apply_adjustments(expr, adjustments);
-        if expr_ty.references_error() {
-            Ok(self.tcx.types.err)
+        Ok(if expr_ty.references_error() {
+            self.tcx.types.err
         } else {
-            Ok(target)
-        }
+            target
+        })
     }
 
     /// Same as `try_coerce()`, but without side-effects.

src/librustc_typeck/check/mod.rs

@@ -3751,36 +3751,25 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         if let Some(ref init) = local.init {
             let init_ty = self.check_decl_initializer(local, &init);
-            if init_ty.references_error() {
-                // Override the types everywhere with `types.err` to avoid knock down errors.
-                self.write_ty(local.hir_id, init_ty);
-                self.write_ty(local.pat.hir_id, init_ty);
-                self.locals.borrow_mut().insert(local.hir_id, LocalTy {
-                    decl_ty: t,
-                    revealed_ty: init_ty,
-                });
-                self.locals.borrow_mut().insert(local.pat.hir_id, LocalTy {
-                    decl_ty: t,
-                    revealed_ty: init_ty,
-                });
-            }
+            self.overwrite_local_ty_if_err(local, t, init_ty);
         }
 
         self.check_pat_top(&local.pat, t, None);
         let pat_ty = self.node_ty(local.pat.hir_id);
-        debug!("check_decl_local pat_ty {:?}", pat_ty);
-        if pat_ty.references_error() {
+        self.overwrite_local_ty_if_err(local, t, pat_ty);
+    }
+
+    fn overwrite_local_ty_if_err(&self, local: &'tcx hir::Local, decl_ty: Ty<'tcx>, ty: Ty<'tcx>) {
+        if ty.references_error() {
             // Override the types everywhere with `types.err` to avoid knock down errors.
-            self.write_ty(local.hir_id, pat_ty);
-            self.write_ty(local.pat.hir_id, pat_ty);
-            self.locals.borrow_mut().insert(local.hir_id, LocalTy {
-                decl_ty: t,
-                revealed_ty: pat_ty,
-            });
-            self.locals.borrow_mut().insert(local.pat.hir_id, LocalTy {
-                decl_ty: t,
-                revealed_ty: pat_ty,
-            });
+            self.write_ty(local.hir_id, ty);
+            self.write_ty(local.pat.hir_id, ty);
+            let local_ty = LocalTy {
+                decl_ty,
+                revealed_ty: ty,
+            };
+            self.locals.borrow_mut().insert(local.hir_id, local_ty);
+            self.locals.borrow_mut().insert(local.pat.hir_id, local_ty);
         }
     }
 

src/test/ui/issues/issue-33575.rs

@@ -1,4 +1,4 @@
 fn main() {
     let baz = ().foo(); //~ ERROR no method named `foo` found for type `()` in the current scope
-    <i32 as std::str::FromStr>::from_str(&baz); // No complains about `str` being unsized
+    <i32 as std::str::FromStr>::from_str(&baz); // No complaints about `str` being unsized
 }