Update UI tests

Author: Sa4dUs

tests/ui/autodiff/visibility.rs

@@ -10,7 +10,6 @@ use std::autodiff::autodiff_forward;
 extern crate my_macro;
 use my_macro::autodiff_forward; // bring `autodiff_forward` in scope
 
-#[autodiff_forward]
+#[autodiff_forward(dfoo)]
 //[std_autodiff]~^^^ ERROR the name `autodiff_forward` is defined multiple times
-//[std_autodiff]~^^ ERROR this rustc version does not support autodiff
 fn foo() {}

tests/ui/autodiff/visibility.std_autodiff.stderr

@@ -3,7 +3,7 @@ error[E0252]: the name `autodiff_forward` is defined multiple times
    |
 LL | use std::autodiff::autodiff_forward;
    |     ------------------------------- previous import of the macro `autodiff_forward` here
-...
+LL | extern crate my_macro;
 LL | use my_macro::autodiff_forward; // bring `autodiff_forward` in scope
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ `autodiff_forward` reimported here
    |
@@ -13,12 +13,6 @@ help: you can use `as` to change the binding name of the import
 LL | use my_macro::autodiff_forward as other_autodiff_forward; // bring `autodiff_forward` in scope
    |                                +++++++++++++++++++++++++
 
-error: this rustc version does not support autodiff_forward
-  --> $DIR/visibility.rs:13:1
-   |
-LL | #[autodiff_forward]
-   | ^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0252`.