Fix ui tests (E0308 error) (#3040)

substrate/core/sr-api-macros/tests/ui/impl_incorrect_method_signature.stderr

@@ -10,4 +10,14 @@ error[E0053]: method `test` has an incompatible type for trait
    = note: expected type `fn(u64)`
               found type `fn(std::string::String)`
 
-For more information about this error, try `rustc --explain E0053`.
+error[E0308]: mismatched types
+  --> $DIR/impl_incorrect_method_signature.rs:20:11
+   |
+20 |         fn test(data: String) {}
+   |                 ^^^^ expected u64, found struct `std::string::String`
+   |
+   = note: expected type `u64`
+              found type `std::string::String`
+
+Some errors have detailed explanations: E0053, E0308.
+For more information about an error, try `rustc --explain E0053`.

substrate/core/sr-api-macros/tests/ui/type_reference_in_impl_runtime_apis_call.stderr

@@ -10,4 +10,20 @@ error[E0053]: method `test` has an incompatible type for trait
    = note: expected type `fn(u64)`
               found type `fn(&u64)`
 
-For more information about this error, try `rustc --explain E0053`.
+error[E0308]: mismatched types
+  --> $DIR/type_reference_in_impl_runtime_apis_call.rs:18:1
+   |
+18 | / impl_runtime_apis! {
+19 | |     impl self::Api<Block> for Runtime {
+20 | |         fn test(data: &u64) {
+21 | |             unimplemented!()
+22 | |         }
+23 | |     }
+24 | | }
+   | |_^ expected u64, found &u64
+   |
+   = note: expected type `u64`
+              found type `&u64`
+
+Some errors have detailed explanations: E0053, E0308.
+For more information about an error, try `rustc --explain E0053`.