Move /src/test to /tests

tests/ui/variance/variance-trait-object-bound.rs

@@ -0,0 +1,18 @@
+// Checks that regions which appear in a trait object type are
+// observed by the variance inference algorithm (and hence
+// `TOption` is contavariant w/r/t `'a` and not bivariant).
+//
+// Issue #18262.
+
+#![feature(rustc_attrs)]
+
+use std::mem;
+
+trait T { fn foo(&self); }
+
+#[rustc_variance]
+struct TOption<'a> { //~ ERROR [-]
+    v: Option<Box<dyn T + 'a>>,
+}
+
+fn main() { }