Port #[non_exhaustive] to the new attribute parsing infrastructure

tests/ui/attributes/malformed-attrs.stderr

@@ -206,12 +206,6 @@ error: malformed `automatically_derived` attribute input
 LL | #[automatically_derived = 18]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[automatically_derived]`
 
-error: malformed `non_exhaustive` attribute input
-  --> $DIR/malformed-attrs.rs:196:1
-   |
-LL | #[non_exhaustive = 1]
-   | ^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[non_exhaustive]`
-
 error: malformed `thread_local` attribute input
   --> $DIR/malformed-attrs.rs:202:1
    |
@@ -552,6 +546,15 @@ LL | #[rustc_layout_scalar_valid_range_end]
    | expected this to be a list
    | help: must be of the form: `#[rustc_layout_scalar_valid_range_end(end)]`
 
+error[E0565]: malformed `non_exhaustive` attribute input
+  --> $DIR/malformed-attrs.rs:196:1
+   |
+LL | #[non_exhaustive = 1]
+   | ^^^^^^^^^^^^^^^^^---^
+   | |                |
+   | |                didn't expect any arguments here
+   | help: must be of the form: `#[non_exhaustive]`
+
 error: attribute should be applied to `const fn`
   --> $DIR/malformed-attrs.rs:34:1
    |

tests/ui/lint/unused/unused-attr-duplicate.stderr

@@ -65,18 +65,6 @@ LL | #[should_panic]
    | ^^^^^^^^^^^^^^^
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 
-error: unused attribute
-  --> $DIR/unused-attr-duplicate.rs:66:1
-   |
-LL | #[non_exhaustive]
-   | ^^^^^^^^^^^^^^^^^ help: remove this attribute
-   |
-note: attribute also specified here
-  --> $DIR/unused-attr-duplicate.rs:65:1
-   |
-LL | #[non_exhaustive]
-   | ^^^^^^^^^^^^^^^^^
-
 error: unused attribute
   --> $DIR/unused-attr-duplicate.rs:70:1
    |
@@ -190,6 +178,18 @@ LL | #[must_use]
    | ^^^^^^^^^^^
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
 
+error: unused attribute
+  --> $DIR/unused-attr-duplicate.rs:66:1
+   |
+LL | #[non_exhaustive]
+   | ^^^^^^^^^^^^^^^^^ help: remove this attribute
+   |
+note: attribute also specified here
+  --> $DIR/unused-attr-duplicate.rs:65:1
+   |
+LL | #[non_exhaustive]
+   | ^^^^^^^^^^^^^^^^^
+
 error: unused attribute
   --> $DIR/unused-attr-duplicate.rs:74:1
    |

tests/ui/rfcs/rfc-2008-non-exhaustive/invalid-attribute.stderr

@@ -1,8 +1,11 @@
-error: malformed `non_exhaustive` attribute input
+error[E0565]: malformed `non_exhaustive` attribute input
   --> $DIR/invalid-attribute.rs:1:1
    |
 LL | #[non_exhaustive(anything)]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[non_exhaustive]`
+   | ^^^^^^^^^^^^^^^^----------^
+   | |               |
+   | |               didn't expect any arguments here
+   | help: must be of the form: `#[non_exhaustive]`
 
 error[E0701]: attribute should be applied to a struct or enum
   --> $DIR/invalid-attribute.rs:5:1
@@ -27,4 +30,5 @@ LL | | }
 
 error: aborting due to 3 previous errors
 
-For more information about this error, try `rustc --explain E0701`.
+Some errors have detailed explanations: E0565, E0701.
+For more information about an error, try `rustc --explain E0565`.