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, 0 insertions, 32 deletions

diff --git a/src/test/ui/impl-trait/nested_impl_trait.rs b/src/test/ui/impl-trait/nested_impl_trait.rs
deleted file mode 100644
index e95fab3b650..00000000000
--- a/src/test/ui/impl-trait/nested_impl_trait.rs
+++ /dev/null
@@ -1,32 +0,0 @@
-#![feature(impl_trait_in_fn_trait_return)]
-use std::fmt::Debug;
-
-fn fine(x: impl Into<u32>) -> impl Into<u32> { x }
-
-fn bad_in_ret_position(x: impl Into<u32>) -> impl Into<impl Debug> { x }
-//~^ ERROR nested `impl Trait` is not allowed
-//~| ERROR the trait bound `impl Debug: From<impl Into<u32>>` is not satisfied
-
-fn bad_in_fn_syntax(x: fn() -> impl Into<impl Debug>) {}
-//~^ ERROR nested `impl Trait` is not allowed
-//~| `impl Trait` only allowed in function and inherent method return types
-
-fn bad_in_arg_position(_: impl Into<impl Debug>) { }
-//~^ ERROR nested `impl Trait` is not allowed
-
-struct X;
-impl X {
-    fn bad(x: impl Into<u32>) -> impl Into<impl Debug> { x }
-    //~^ ERROR nested `impl Trait` is not allowed
-    //~| ERROR the trait bound `impl Debug: From<impl Into<u32>>` is not satisfied
-}
-
-fn allowed_in_assoc_type() -> impl Iterator<Item=impl Fn()> {
-    vec![|| println!("woot")].into_iter()
-}
-
-fn allowed_in_ret_type() -> impl Fn() -> impl Into<u32> {
-    || 5u8
-}
-
-fn main() {}