Move /src/test to /tests

tests/ui/borrowck/move-error-snippets.stderr

@@ -0,0 +1,20 @@
+error[E0507]: cannot move out of static item `D`
+  --> $DIR/move-error-snippets-ext.rs:5:17
+   |
+LL |         let a = $c;
+   |                 ^^ move occurs because `D` has type `A`, which does not implement the `Copy` trait
+   |
+  ::: $DIR/move-error-snippets.rs:21:1
+   |
+LL | sss!();
+   | ------ in this macro invocation
+   |
+   = note: this error originates in the macro `aaa` which comes from the expansion of the macro `sss` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider borrowing here
+   |
+LL |         let a = &$c;
+   |                 +
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0507`.