Do not issue E0071 if a type error has already been reported

compiler/rustc_error_codes/src/error_codes/E0071.md

@@ -15,13 +15,13 @@ form of initializer was used.
 For example, the code above can be fixed to:
 
 ```
-enum Foo {
+type U32 = u32;
-    FirstValue(i32)
+let t: U32 = 4;
-}
+```
-
+
-fn main() {
+or:
-    let u = Foo::FirstValue(0i32);
+
-
+```
-    let t = 4;
+struct U32 { value: u32 }
-}
+let t = U32 { value: 4 };
 ```

compiler/rustc_typeck/src/check/fn_ctxt/checks.rs

@@ -494,6 +494,14 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
             Some((variant, ty))
         } else {
+            match ty.kind() {
+                ty::Error(_) => {
+                    // E0071 might be caused by a spelling error, which will have
+                    // already caused an error message and probably a suggestion
+                    // elsewhere. Refrain from emitting more unhelpful errors here
+                    // (issue #88844).
+                }
+                _ => {
                     struct_span_err!(
                         self.tcx.sess,
                         path_span,
@@ -503,6 +511,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     )
                     .span_label(path_span, "not a struct")
                     .emit();
+                }
+            }
             None
         }
     }

src/test/ui/typeck/issue-88844.rs

@@ -0,0 +1,14 @@
+// Regression test for #88844.
+
+struct Struct { value: i32 }
+//~^ NOTE: similarly named struct `Struct` defined here
+
+impl Stuct {
+//~^ ERROR: cannot find type `Stuct` in this scope [E0412]
+//~| HELP: a struct with a similar name exists
+    fn new() -> Self {
+        Self { value: 42 }
+    }
+}
+
+fn main() {}

src/test/ui/typeck/issue-88844.stderr

@@ -0,0 +1,12 @@
+error[E0412]: cannot find type `Stuct` in this scope
+  --> $DIR/issue-88844.rs:6:6
+   |
+LL | struct Struct { value: i32 }
+   | ------------- similarly named struct `Struct` defined here
+...
+LL | impl Stuct {
+   |      ^^^^^ help: a struct with a similar name exists: `Struct`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0412`.