Move /src/test to /tests

src/test/ui/recursion/issue-38591-non-regular-dropck-recursion.rs

@@ -1,16 +0,0 @@
-// `S` is infinitely recursing so it's not possible to generate a finite
-// drop impl (ignoring polymorphization).
-//
-// Dropck should therefore detect that this is the case and eagerly error.
-
-struct S<T> {
-    t: T,
-    s: Box<S<fn(u: T)>>,
-}
-
-fn f(x: S<u32>) {} //~ ERROR overflow while adding drop-check rules for S<u32>
-
-fn main() {
-    // Force instantiation.
-    f as fn(_);
-}