Move /src/test to /tests

tests/ui/async-await/async-borrowck-escaping-block-error.fixed

@@ -0,0 +1,18 @@
+// edition:2018
+// run-rustfix
+
+fn test_boxed() -> Box<impl std::future::Future<Output = u32>> {
+    let x = 0u32;
+    Box::new(async move { x } )
+    //~^ ERROR E0373
+}
+
+fn test_ref(x: &u32) -> impl std::future::Future<Output = u32> + '_ {
+    async move { *x }
+    //~^ ERROR E0373
+}
+
+fn main() {
+    let _ = test_boxed();
+    let _ = test_ref(&0u32);
+}