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, 10 insertions, 0 deletions

diff --git a/tests/rustdoc-ui/error-in-impl-trait/trait-alias.rs b/tests/rustdoc-ui/error-in-impl-trait/trait-alias.rs
new file mode 100644
index 00000000000..c18a024af4b
--- /dev/null
+++ b/tests/rustdoc-ui/error-in-impl-trait/trait-alias.rs
@@ -0,0 +1,10 @@
+// check-pass
+#![feature(type_alias_impl_trait)]
+
+pub trait ValidTrait {}
+type ImplTrait = impl ValidTrait;
+
+/// This returns impl trait, but using a type alias
+pub fn h() -> ImplTrait {
+    error::_in::impl_trait::alias()
+}