Do not give incorrect label for return type mismatch

src/test/ui/point-to-type-err-cause-on-impl-trait-return-2.rs

@@ -0,0 +1,17 @@
+fn unrelated() -> Result<(), std::string::ParseError> {  // #57664
+    let x = 0;
+
+    match x {
+        1 => {
+            let property_value_as_string = "a".parse()?;
+        }
+        2 => {
+            let value: &bool = unsafe { &42 };
+            //~^ ERROR mismatched types
+        }
+    };
+
+    Ok(())
+}
+
+fn main() {}

src/test/ui/point-to-type-err-cause-on-impl-trait-return-2.stderr

@@ -0,0 +1,12 @@
+error[E0308]: mismatched types
+  --> $DIR/point-to-type-err-cause-on-impl-trait-return-2.rs:9:41
+   |
+LL |             let value: &bool = unsafe { &42 };
+   |                                         ^^^ expected bool, found integer
+   |
+   = note: expected type `&bool`
+              found type `&{integer}`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.

src/test/ui/point-to-type-err-cause-on-impl-trait-return.rs

@@ -0,0 +1,36 @@
+fn foo() -> impl std::fmt::Display {
+    if false {
+        return 0i32;
+    }
+    1u32
+    //~^ ERROR mismatched types
+}
+
+fn bar() -> impl std::fmt::Display {
+    if false {
+        return 0i32;
+    } else {
+        return 1u32;
+        //~^ ERROR mismatched types
+    }
+}
+
+fn baz() -> impl std::fmt::Display {
+    if false {
+    //~^ ERROR mismatched types
+        return 0i32;
+    } else {
+        1u32
+    }
+}
+
+fn qux() -> impl std::fmt::Display {
+    if false {
+        //~^ ERROR if and else have incompatible types
+        0i32
+    } else {
+        1u32
+    }
+}
+
+fn main() {}

src/test/ui/point-to-type-err-cause-on-impl-trait-return.stderr

@@ -0,0 +1,52 @@
+error[E0308]: mismatched types
+  --> $DIR/point-to-type-err-cause-on-impl-trait-return.rs:5:5
+   |
+LL |         return 0i32;
+   |                ---- expected because of this statement
+LL |     }
+LL |     1u32
+   |     ^^^^ expected i32, found u32
+   |
+   = note: expected type `i32`
+              found type `u32`
+
+error[E0308]: mismatched types
+  --> $DIR/point-to-type-err-cause-on-impl-trait-return.rs:13:16
+   |
+LL |         return 1u32;
+   |                ^^^^ expected i32, found u32
+   |
+   = note: expected type `i32`
+              found type `u32`
+
+error[E0308]: mismatched types
+  --> $DIR/point-to-type-err-cause-on-impl-trait-return.rs:19:5
+   |
+LL | /     if false {
+LL | |     //~^ ERROR mismatched types
+LL | |         return 0i32;
+LL | |     } else {
+LL | |         1u32
+LL | |     }
+   | |_____^ expected i32, found u32
+   |
+   = note: expected type `i32`
+              found type `u32`
+
+error[E0308]: if and else have incompatible types
+  --> $DIR/point-to-type-err-cause-on-impl-trait-return.rs:28:5
+   |
+LL | /     if false {
+LL | |         //~^ ERROR if and else have incompatible types
+LL | |         0i32
+LL | |     } else {
+LL | |         1u32
+LL | |     }
+   | |_____^ expected i32, found u32
+   |
+   = note: expected type `i32`
+              found type `u32`
+
+error: aborting due to 4 previous errors
+
+For more information about this error, try `rustc --explain E0308`.