clippy: add test for rust-lang/rust-clippy#10645 which will be fixed in

rust-lang#110476

src/tools/clippy/tests/ui/crashes/ice-5207.rs

@@ -1,5 +1,8 @@
-// Regression test for https://github.com/rust-lang/rust-clippy/issues/5207
+// compile-flags: --cap-lints=warn
+// ^ for https://github.com/rust-lang/rust-clippy/issues/10645
 
+// Regression test for https://github.com/rust-lang/rust-clippy/issues/5207
+#![warn(clippy::future_not_send)]
 pub async fn bar<'a, T: 'a>(_: T) {}
 
 fn main() {}

src/tools/clippy/tests/ui/crashes/ice-5207.stderr

@@ -0,0 +1,16 @@
+warning: future cannot be sent between threads safely
+  --> $DIR/ice-5207.rs:6:35
+   |
+LL | pub async fn bar<'a, T: 'a>(_: T) {}
+   |                                   ^ future returned by `bar` is not `Send`
+   |
+note: captured value is not `Send`
+  --> $DIR/ice-5207.rs:6:29
+   |
+LL | pub async fn bar<'a, T: 'a>(_: T) {}
+   |                             ^ has type `T` which is not `Send`
+   = note: `T` doesn't implement `std::marker::Send`
+   = note: `-D clippy::future-not-send` implied by `-D warnings`
+
+warning: 1 warning emitted
+