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, 21 insertions, 0 deletions

diff --git a/tests/ui/empty/empty-struct-unit-expr.rs b/tests/ui/empty/empty-struct-unit-expr.rs
new file mode 100644
index 00000000000..8f3688a2a07
--- /dev/null
+++ b/tests/ui/empty/empty-struct-unit-expr.rs
@@ -0,0 +1,21 @@
+// Can't use unit struct as constructor function
+
+// aux-build:empty-struct.rs
+
+extern crate empty_struct;
+use empty_struct::*;
+
+struct Empty2;
+
+enum E {
+    Empty4
+}
+
+fn main() {
+    let e2 = Empty2(); //~ ERROR expected function, found struct `Empty2`
+    let e4 = E::Empty4();
+    //~^ ERROR expected function, found enum variant `E::Empty4` [E0618]
+    let xe2 = XEmpty2(); //~ ERROR expected function, found struct `XEmpty2`
+    let xe4 = XE::XEmpty4();
+    //~^ ERROR expected function, found enum variant `XE::XEmpty4` [E0618]
+}