Split must_use_unit test into an unfixable part

With the attribute refactor in rustc, making this case machine applicable is not
easily possible anymore. This splits up the tests properly.

Author: flip1995

tests/ui/must_use_unit.fixed

@@ -26,11 +26,3 @@ fn main() {
         fn foo() {}
     );
 }
-
-#[cfg_attr(all(), deprecated)]
-fn issue_12320() {}
-//~^ must_use_unit
-
-#[cfg_attr(all(), deprecated, doc = "foo")]
-fn issue_12320_2() {}
-//~^ must_use_unit

tests/ui/must_use_unit.rs

@@ -29,11 +29,3 @@ fn main() {
         fn foo() {}
     );
 }
-
-#[cfg_attr(all(), must_use, deprecated)]
-fn issue_12320() {}
-//~^ must_use_unit
-
-#[cfg_attr(all(), deprecated, doc = "foo", must_use)]
-fn issue_12320_2() {}
-//~^ must_use_unit

tests/ui/must_use_unit.stderr

@@ -25,21 +25,5 @@ LL | #[must_use = "With note"]
 LL | pub fn must_use_with_note() {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: this unit-returning function has a `#[must_use]` attribute
-  --> tests/ui/must_use_unit.rs:34:1
-   |
-LL | #[cfg_attr(all(), must_use, deprecated)]
-   |                   -------------------- help: change these attributes to: `deprecated`
-LL | fn issue_12320() {}
-   | ^^^^^^^^^^^^^^^^
-
-error: this unit-returning function has a `#[must_use]` attribute
-  --> tests/ui/must_use_unit.rs:38:1
-   |
-LL | #[cfg_attr(all(), deprecated, doc = "foo", must_use)]
-   |                   --------------------------------- help: change these attributes to: `deprecated, doc = "foo"`
-LL | fn issue_12320_2() {}
-   | ^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 5 previous errors
+error: aborting due to 3 previous errors
 

tests/ui/must_use_unit_unfixable.rs

@@ -0,0 +1,11 @@
+//@no-rustfix
+
+#[cfg_attr(all(), must_use, deprecated)]
+fn issue_12320() {}
+//~^ must_use_unit
+
+#[cfg_attr(all(), deprecated, doc = "foo", must_use)]
+fn issue_12320_2() {}
+//~^ must_use_unit
+
+fn main() {}

tests/ui/must_use_unit_unfixable.stderr

@@ -0,0 +1,28 @@
+error: this unit-returning function has a `#[must_use]` attribute
+  --> tests/ui/must_use_unit_unfixable.rs:4:1
+   |
+LL | fn issue_12320() {}
+   | ^^^^^^^^^^^^^^^^
+   |
+help: remove `must_use`
+  --> tests/ui/must_use_unit_unfixable.rs:3:19
+   |
+LL | #[cfg_attr(all(), must_use, deprecated)]
+   |                   ^^^^^^^^
+   = note: `-D clippy::must-use-unit` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::must_use_unit)]`
+
+error: this unit-returning function has a `#[must_use]` attribute
+  --> tests/ui/must_use_unit_unfixable.rs:8:1
+   |
+LL | fn issue_12320_2() {}
+   | ^^^^^^^^^^^^^^^^^^
+   |
+help: remove `must_use`
+  --> tests/ui/must_use_unit_unfixable.rs:7:44
+   |
+LL | #[cfg_attr(all(), deprecated, doc = "foo", must_use)]
+   |                                            ^^^^^^^^
+
+error: aborting due to 2 previous errors
+