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, 37 insertions, 0 deletions

diff --git a/tests/ui/annotate-snippet/auxiliary/multispan.rs b/tests/ui/annotate-snippet/auxiliary/multispan.rs
new file mode 100644
index 00000000000..c05d15643db
--- /dev/null
+++ b/tests/ui/annotate-snippet/auxiliary/multispan.rs
@@ -0,0 +1,37 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+#![feature(proc_macro_diagnostic, proc_macro_span, proc_macro_def_site)]
+
+extern crate proc_macro;
+
+use proc_macro::{TokenStream, TokenTree, Span, Diagnostic};
+
+fn parse(input: TokenStream) -> Result<(), Diagnostic> {
+    let mut hi_spans = vec![];
+    for tree in input {
+        if let TokenTree::Ident(ref ident) = tree {
+            if ident.to_string() == "hi" {
+                hi_spans.push(ident.span());
+            }
+        }
+    }
+
+    if !hi_spans.is_empty() {
+        return Err(Span::def_site()
+                       .error("hello to you, too!")
+                       .span_note(hi_spans, "found these 'hi's"));
+    }
+
+    Ok(())
+}
+
+#[proc_macro]
+pub fn hello(input: TokenStream) -> TokenStream {
+    if let Err(diag) = parse(input) {
+        diag.emit();
+    }
+
+    TokenStream::new()
+}