Move /src/test to /tests

tests/ui/chalkify/trait-objects.rs

@@ -0,0 +1,12 @@
+// check-pass
+// compile-flags: -Z trait-solver=chalk
+
+use std::fmt::Display;
+
+fn main() {
+    let d: &dyn Display = &mut 3;
+    d.to_string();
+    (&d).to_string();
+    let f: &dyn Fn(i32) -> _ = &|x| x + x;
+    f(2);
+}