Fix tests

examples/src/fail_tests/auto_covariant.stderr

@@ -1,15 +1,22 @@
 error: Ouroboros cannot automatically determine if this type is covariant.
 
-       If it is covariant, it should be legal to convert any instance of that type to an instance of that type where all usages of 'this are replaced with a smaller lifetime. For example, Box<&'this i32> is covariant because it is legal to use it as a Box<&'a i32> where 'this: 'a. In contrast, Fn(&'this i32) cannot be used as Fn(&'a i32).
+If it is covariant, it should be legal to convert any instance of that type to an instance of that type where all usages of 'this are replaced with a smaller lifetime. For example, Box<&'this i32> is covariant because it is legal to use it as a Box<&'a i32> where 'this: 'a. In contrast, Fn(&'this i32) cannot be used as Fn(&'a i32).
+
+To resolve this error, add #[covariant] or #[not_covariant] to the field.
 
-       To resolve this error, add #[covariant] or #[not_covariant] to the field.
   --> $DIR/auto_covariant.rs:11:12
    |
 11 |     field: NotGuaranteedCovariant<'this>
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0601]: `main` function not found in crate `$CRATE`
-  --> $DIR/auto_covariant.rs:12:2
+  --> $DIR/auto_covariant.rs:1:1
    |
-12 | }
-   |  ^ consider adding a `main` function to `$DIR/src/fail_tests/auto_covariant.rs`
+1  | / use ouroboros::self_referencing;
+2  | |
+3  | | struct NotGuaranteedCovariant<'a> {
+4  | |     data: &'a (),
+...  |
+11 | |     field: NotGuaranteedCovariant<'this>
+12 | | }
+   | |_^ consider adding a `main` function to `$DIR/src/fail_tests/auto_covariant.rs`

examples/src/fail_tests/borrowchk_custom_drop.stderr

@@ -8,4 +8,4 @@ error[E0597]: `bar` does not live long enough
   | |                 borrow might be used here, when `bar` is dropped and runs the `Drop` code for type `Bar`
   | borrowed value does not live long enough
   |
-  = note: this error originates in the attribute macro `self_referencing` (in Nightly builds, run with -Z macro-backtrace for more info)
+  = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)

examples/src/fail_tests/borrowchk_external_lifetime.stderr

@@ -10,4 +10,4 @@ error[E0597]: `o` does not live long enough
 4 | pub struct S<'a> {
   |              -- lifetime `'a` defined here
   |
-  = note: this error originates in the attribute macro `self_referencing` (in Nightly builds, run with -Z macro-backtrace for more info)
+  = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)

examples/src/fail_tests/move_ref_outside_closure.stderr

@@ -4,7 +4,7 @@ error[E0495]: cannot infer an appropriate lifetime due to conflicting requiremen
 16 |     instance.with_data_ref(|dref| stored_ref = Some(*dref));
    |                                                ^^^^^^^^^^^
    |
-note: first, the lifetime cannot outlive the anonymous lifetime #1 defined here...
+note: first, the lifetime cannot outlive the anonymous lifetime #2 defined on the body at 16:28...
   --> $DIR/move_ref_outside_closure.rs:16:28
    |
 16 |     instance.with_data_ref(|dref| stored_ref = Some(*dref));

examples/src/fail_tests/refuse_non_std_box.stderr

@@ -4,6 +4,4 @@ error[E0599]: no function or associated item named `is_std_box_type` found for s
 19 | #[self_referencing]
    | ^^^^^^^^^^^^^^^^^^^ function or associated item not found in `CheckIfTypeIsStd<Box<String>>`
    |
-   = note: the function or associated item was found for
-           - `CheckIfTypeIsStd<std::boxed::Box<T>>`
-   = note: this error originates in the attribute macro `self_referencing` (in Nightly builds, run with -Z macro-backtrace for more info)
+   = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)

examples/src/fail_tests/use_after_free.stderr

@@ -2,7 +2,7 @@ error[E0505]: cannot move out of `instance` because it is borrowed
   --> $DIR/use_after_free.rs:16:10
    |
 15 |     let data_ref = instance.with_data_ref(|dref| *dref);
-   |                    ------------------------------------ borrow of `instance` occurs here
+   |                    -------- borrow of `instance` occurs here
 16 |     drop(instance);
    |          ^^^^^^^^ move out of `instance` occurs here
 17 |     println!("{:?}", data_ref);

examples/src/fail_tests/use_moved_ref_after_free.stderr

@@ -2,7 +2,7 @@ error[E0505]: cannot move out of `instance` because it is borrowed
   --> $DIR/use_moved_ref_after_free.rs:17:10
    |
 16 |     instance.with_data_ref(|dref| stored_ref = Some(*dref));
-   |     ------------------------------------------------------- borrow of `instance` occurs here
+   |     -------- borrow of `instance` occurs here
 17 |     drop(instance);
    |          ^^^^^^^^ move out of `instance` occurs here
 18 |     println!("{:?}", stored_ref);