Update ui tests.

Author: m-ou-se

tests/ui/borrowck/issue-64453.stderr

@@ -1,4 +1,4 @@
-error: `Arguments::<'a>::new_const` is not yet stable as a const fn
+error: `Arguments::<'a>::new_str` is not yet stable as a const fn
   --> $DIR/issue-64453.rs:4:31
    |
 LL | static settings_dir: String = format!("");

tests/ui/fmt/send-sync.stderr

@@ -1,41 +1,27 @@
-error[E0277]: `core::fmt::rt::Opaque` cannot be shared between threads safely
+error[E0277]: `Arguments<'_>` cannot be sent between threads safely
   --> $DIR/send-sync.rs:8:10
    |
 LL |     send(format_args!("{:?}", c));
-   |     ---- ^^^^^^^^^^^^^^^^^^^^^^^ `core::fmt::rt::Opaque` cannot be shared between threads safely
+   |     ---- ^^^^^^^^^^^^^^^^^^^^^^^ `Arguments<'_>` cannot be sent between threads safely
    |     |
    |     required by a bound introduced by this call
    |
-   = help: within `[core::fmt::rt::Argument<'_>]`, the trait `Sync` is not implemented for `core::fmt::rt::Opaque`
-   = note: required because it appears within the type `&core::fmt::rt::Opaque`
-note: required because it appears within the type `Argument<'_>`
-  --> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
-   = note: required because it appears within the type `[Argument<'_>]`
-   = note: required for `&[core::fmt::rt::Argument<'_>]` to implement `Send`
-note: required because it appears within the type `Arguments<'_>`
-  --> $SRC_DIR/core/src/fmt/mod.rs:LL:COL
+   = help: the trait `Send` is not implemented for `Arguments<'_>`
 note: required by a bound in `send`
   --> $DIR/send-sync.rs:1:12
    |
 LL | fn send<T: Send>(_: T) {}
    |            ^^^^ required by this bound in `send`
 
-error[E0277]: `core::fmt::rt::Opaque` cannot be shared between threads safely
+error[E0277]: `Arguments<'_>` cannot be shared between threads safely
   --> $DIR/send-sync.rs:9:10
    |
 LL |     sync(format_args!("{:?}", c));
-   |     ---- ^^^^^^^^^^^^^^^^^^^^^^^ `core::fmt::rt::Opaque` cannot be shared between threads safely
+   |     ---- ^^^^^^^^^^^^^^^^^^^^^^^ `Arguments<'_>` cannot be shared between threads safely
    |     |
    |     required by a bound introduced by this call
    |
-   = help: within `Arguments<'_>`, the trait `Sync` is not implemented for `core::fmt::rt::Opaque`
-   = note: required because it appears within the type `&core::fmt::rt::Opaque`
-note: required because it appears within the type `Argument<'_>`
-  --> $SRC_DIR/core/src/fmt/rt.rs:LL:COL
-   = note: required because it appears within the type `[Argument<'_>]`
-   = note: required because it appears within the type `&[Argument<'_>]`
-note: required because it appears within the type `Arguments<'_>`
-  --> $SRC_DIR/core/src/fmt/mod.rs:LL:COL
+   = help: the trait `Sync` is not implemented for `Arguments<'_>`
 note: required by a bound in `sync`
   --> $DIR/send-sync.rs:2:12
    |