Auto merge of #106458 - albertlarsan68:move-tests, r=jyn514

Move src/test to the root

See MCP at rust-lang/compiler-team#573

There may be more changes needed.

The first commit is just the move of the files:
You can check that the first commit did not do anything else than renames by running
```
git diff --diff-filter=r -M100% <rust-lang remote>/master <first commit hash>
```
The output should be empty, because the filter excludes renames, and the match threshold for qualifying a rename is 100%.

The second one is mostly a "find and replace" of `src/test` to `tests` and whatever is needed to make CI pass.

What is left to do:
---

- [x] Move directory
- [ ] Change references to `src/test`
    - [x] Change references in-tree
    - [ ] Change references in submodules / out-of-tree docs
- [x] Make CI pass:
    - [x] Fix tidy
    - [x] Fix tests
    - [x] Bless tests if needed (shouldn't normally)
- [ ] Merge it !

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/ui/array-slice-vec/vec-matching-fold.rs b/tests/ui/array-slice-vec/vec-matching-fold.rs
new file mode 100644
index 00000000000..998899271e4
--- /dev/null
+++ b/tests/ui/array-slice-vec/vec-matching-fold.rs
@@ -0,0 +1,46 @@
+// run-pass
+
+use std::fmt::Debug;
+
+fn foldl<T, U, F>(values: &[T],
+                  initial: U,
+                  mut function: F)
+                  -> U where
+    U: Clone+Debug, T:Debug,
+    F: FnMut(U, &T) -> U,
+{    match values {
+        &[ref head, ref tail @ ..] =>
+            foldl(tail, function(initial, head), function),
+        &[] => {
+            // FIXME: call guards
+            let res = initial.clone(); res
+        }
+    }
+}
+
+fn foldr<T, U, F>(values: &[T],
+                  initial: U,
+                  mut function: F)
+                  -> U where
+    U: Clone,
+    F: FnMut(&T, U) -> U,
+{
+    match values {
+        &[ref head @ .., ref tail] =>
+            foldr(head, function(tail, initial), function),
+        &[] => {
+            // FIXME: call guards
+            let res = initial.clone(); res
+        }
+    }
+}
+
+pub fn main() {
+    let x = &[1, 2, 3, 4, 5];
+
+    let product = foldl(x, 1, |a, b| a * *b);
+    assert_eq!(product, 120);
+
+    let sum = foldr(x, 0, |a, b| *a + b);
+    assert_eq!(sum, 15);
+}