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, 23 insertions, 0 deletions

diff --git a/tests/ui/proc-macro/nested-macro-rules.rs b/tests/ui/proc-macro/nested-macro-rules.rs
new file mode 100644
index 00000000000..25ffcfad7c7
--- /dev/null
+++ b/tests/ui/proc-macro/nested-macro-rules.rs
@@ -0,0 +1,23 @@
+// run-pass
+// aux-build:nested-macro-rules.rs
+// aux-build:test-macros.rs
+// compile-flags: -Z span-debug -Z macro-backtrace
+// edition:2018
+
+#![no_std] // Don't load unnecessary hygiene information from std
+extern crate std;
+
+extern crate nested_macro_rules;
+extern crate test_macros;
+
+use test_macros::{print_bang, print_attr};
+
+use nested_macro_rules::FirstStruct;
+struct SecondStruct;
+
+fn main() {
+    nested_macro_rules::inner_macro!(print_bang, print_attr);
+
+    nested_macro_rules::outer_macro!(SecondStruct, SecondAttrStruct);
+    inner_macro!(print_bang, print_attr);
+}