chore: move more ui tests

src/tools/tidy/src/issues.txt

@@ -2212,7 +2212,6 @@ ui/issues/issue-41479.rs
 ui/issues/issue-41498.rs
 ui/issues/issue-41549.rs
 ui/issues/issue-41604.rs
-ui/issues/issue-41628.rs
 ui/issues/issue-41652/auxiliary/issue-41652-b.rs
 ui/issues/issue-41652/issue-41652.rs
 ui/issues/issue-41677.rs

src/tools/tidy/src/ui_tests.rs

@@ -17,7 +17,7 @@ use ignore::Walk;
 const ENTRY_LIMIT: u32 = 901;
 // FIXME: The following limits should be reduced eventually.
 
-const ISSUES_ENTRY_LIMIT: u32 = 1624;
+const ISSUES_ENTRY_LIMIT: u32 = 1623;
 
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[
     "rs",     // test source files

tests/ui/used.rs → tests/ui/attributes/positions/used.rs

@@ -1,3 +1,6 @@
+//! Checks that `#[used]` cannot be used on invalid positions.
+#![crate_type = "lib"]
+
 #[used]
 static FOO: u32 = 0; // OK
 
@@ -13,4 +16,8 @@ trait Bar {}
 #[used] //~ ERROR attribute must be applied to a `static` variable
 impl Bar for Foo {}
 
-fn main() {}
+// Regression test for <https://github.com/rust-lang/rust/issues/126789>.
+extern "C" {
+    #[used] //~ ERROR attribute must be applied to a `static` variable
+    static BAR: i32;
+}

tests/ui/used.stderr → tests/ui/attributes/positions/used.stderr

@@ -1,34 +1,42 @@
 error: attribute must be applied to a `static` variable
-  --> $DIR/used.rs:4:1
+  --> $DIR/used.rs:7:1
    |
 LL | #[used]
    | ^^^^^^^
 LL | fn foo() {}
    | ----------- but this is a function
 
 error: attribute must be applied to a `static` variable
-  --> $DIR/used.rs:7:1
+  --> $DIR/used.rs:10:1
    |
 LL | #[used]
    | ^^^^^^^
 LL | struct Foo {}
    | ------------- but this is a struct
 
 error: attribute must be applied to a `static` variable
-  --> $DIR/used.rs:10:1
+  --> $DIR/used.rs:13:1
    |
 LL | #[used]
    | ^^^^^^^
 LL | trait Bar {}
    | ------------ but this is a trait
 
 error: attribute must be applied to a `static` variable
-  --> $DIR/used.rs:13:1
+  --> $DIR/used.rs:16:1
    |
 LL | #[used]
    | ^^^^^^^
 LL | impl Bar for Foo {}
    | ------------------- but this is a implementation block
 
-error: aborting due to 4 previous errors
+error: attribute must be applied to a `static` variable
+  --> $DIR/used.rs:21:5
+   |
+LL |     #[used]
+   |     ^^^^^^^
+LL |     static BAR: i32;
+   |     ---------------- but this is a foreign static item
+
+error: aborting due to 5 previous errors
 

tests/ui/attributes/used/used-not-dead-code-lint.rs

@@ -0,0 +1,10 @@
+//! Checks that the `dead_code` lint does not consider `#[used]` items unused.
+//! Regression test for <https://github.com/rust-lang/rust/issues/41628>.
+
+//@ check-pass
+#![deny(dead_code)]
+
+#[used]
+static FOO: u32 = 0;
+
+fn main() {}

tests/ui/utf8_idents.rs → tests/ui/rfcs/rfc-2457-non-ascii-idents/utf8_idents.rs

@@ -1,14 +1,13 @@
+//! Check that non-ascii-idents are allowed.
+
 //@ check-pass
 //
 #![allow(mixed_script_confusables, non_camel_case_types)]
 
-fn foo<
-    'β,
-    γ
->() {}
+fn foo<'β, γ>() {}
 
 struct X {
-    δ: usize
+    δ: usize,
 }
 
 pub fn main() {