Auto merge of #87600 - JohnTitor:classify-ui-tests, r=petrochenkov

Move some UI tests to more suitable subdirs

The classifui result: https://gist.github.com/JohnTitor/c9e00840990b5e4a8fc562ec3571e427/e06c42226c6038da91e403c33b9947843420cf44

Some notes:
- backtrace-debuginfo.rs: previously I skipped this, I'm still not sure what the best dir is. Any ideas?
- estr-subtyping.rs: Seems a quite old test so removed, shouldn't?
- deref-suggestion.rs: moved to inference as `suggestions` is not an ideal dir.
- issue-43023.rs: a bit misclassified, moved to `derives`

cc #73494
r? `@petrochenkov`

src/test/ui/issues/issue-13641.rs

@@ -1,13 +0,0 @@
-mod a {
-    struct Foo;
-    impl Foo { pub fn new() {} }
-    enum Bar {}
-    impl Bar { pub fn new() {} }
-}
-
-fn main() {
-    a::Foo::new();
-    //~^ ERROR: struct `Foo` is private
-    a::Bar::new();
-    //~^ ERROR: enum `Bar` is private
-}

src/test/ui/issues/issue-13641.stderr

@@ -1,27 +0,0 @@
-error[E0603]: struct `Foo` is private
-  --> $DIR/issue-13641.rs:9:8
-   |
-LL |     a::Foo::new();
-   |        ^^^ private struct
-   |
-note: the struct `Foo` is defined here
-  --> $DIR/issue-13641.rs:2:5
-   |
-LL |     struct Foo;
-   |     ^^^^^^^^^^^
-
-error[E0603]: enum `Bar` is private
-  --> $DIR/issue-13641.rs:11:8
-   |
-LL |     a::Bar::new();
-   |        ^^^ private enum
-   |
-note: the enum `Bar` is defined here
-  --> $DIR/issue-13641.rs:4:5
-   |
-LL |     enum Bar {}
-   |     ^^^^^^^^
-
-error: aborting due to 2 previous errors
-
-For more information about this error, try `rustc --explain E0603`.

src/test/ui/issues/issue-37222.rs

@@ -1,17 +0,0 @@
-// run-pass
-#![allow(dead_code)]
-#[derive(Debug, PartialEq)]
-enum Bar {
-    A(i64),
-    B(i32),
-    C,
-}
-
-#[derive(Debug, PartialEq)]
-struct Foo(Bar, u8);
-
-static FOO: [Foo; 2] = [Foo(Bar::C, 0), Foo(Bar::C, 0xFF)];
-
-fn main() {
-    assert_eq!(&FOO[1],  &Foo(Bar::C, 0xFF));
-}

src/test/ui/issues/issue-43023.rs

@@ -1,20 +0,0 @@
-struct S;
-
-impl S {
-    #[derive(Debug)] //~ ERROR `derive` may only be applied to `struct`s, `enum`s and `union`s
-    fn f() {
-        file!();
-    }
-}
-
-trait Tr1 {
-    #[derive(Debug)] //~ ERROR `derive` may only be applied to `struct`s, `enum`s and `union`s
-    fn f();
-}
-
-trait Tr2 {
-    #[derive(Debug)] //~ ERROR `derive` may only be applied to `struct`s, `enum`s and `union`s
-    type F;
-}
-
-fn main() {}

src/test/ui/issues/issue-43023.stderr

@@ -1,29 +0,0 @@
-error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
-  --> $DIR/issue-43023.rs:4:5
-   |
-LL |       #[derive(Debug)]
-   |       ^^^^^^^^^^^^^^^^ not applicable here
-LL | /     fn f() {
-LL | |         file!();
-LL | |     }
-   | |_____- not a `struct`, `enum` or `union`
-
-error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
-  --> $DIR/issue-43023.rs:11:5
-   |
-LL |     #[derive(Debug)]
-   |     ^^^^^^^^^^^^^^^^ not applicable here
-LL |     fn f();
-   |     ------- not a `struct`, `enum` or `union`
-
-error[E0774]: `derive` may only be applied to `struct`s, `enum`s and `union`s
-  --> $DIR/issue-43023.rs:16:5
-   |
-LL |     #[derive(Debug)]
-   |     ^^^^^^^^^^^^^^^^ not applicable here
-LL |     type F;
-   |     ------- not a `struct`, `enum` or `union`
-
-error: aborting due to 3 previous errors
-
-For more information about this error, try `rustc --explain E0774`.