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/inference/deref-suggestion.rs

@@ -0,0 +1,74 @@
+macro_rules! borrow {
+    ($x:expr) => { &$x } //~ ERROR mismatched types
+}
+
+fn foo(_: String) {}
+
+fn foo2(s: &String) {
+    foo(s);
+    //~^ ERROR mismatched types
+}
+
+fn foo3(_: u32) {}
+fn foo4(u: &u32) {
+    foo3(u);
+    //~^ ERROR mismatched types
+}
+
+struct S<'a> {
+    u: &'a u32,
+}
+
+struct R {
+    i: u32,
+}
+
+fn main() {
+    let s = String::new();
+    let r_s = &s;
+    foo2(r_s);
+    foo(&"aaa".to_owned());
+    //~^ ERROR mismatched types
+    foo(&mut "aaa".to_owned());
+    //~^ ERROR mismatched types
+    foo3(borrow!(0));
+    foo4(&0);
+    assert_eq!(3i32, &3i32);
+    //~^ ERROR mismatched types
+    let u = 3;
+    let s = S { u };
+    //~^ ERROR mismatched types
+    let s = S { u: u };
+    //~^ ERROR mismatched types
+    let i = &4;
+    let r = R { i };
+    //~^ ERROR mismatched types
+    let r = R { i: i };
+    //~^ ERROR mismatched types
+
+
+    let a = &1;
+    let b = &2;
+    let val: i32 = if true {
+        a + 1
+    } else {
+        b
+        //~^ ERROR mismatched types
+    };
+    let val: i32 = if true {
+        let _ = 2;
+        a + 1
+    } else {
+        let _ = 2;
+        b
+        //~^ ERROR mismatched types
+    };
+    let val = if true {
+        *a
+    } else if true {
+    //~^ ERROR incompatible types
+        b
+    } else {
+        &0
+    };
+}

src/test/ui/inference/deref-suggestion.stderr

@@ -0,0 +1,146 @@
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:8:9
+   |
+LL |     foo(s);
+   |         ^- help: try using a conversion method: `.to_string()`
+   |         |
+   |         expected struct `String`, found `&String`
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:14:10
+   |
+LL |     foo3(u);
+   |          ^ expected `u32`, found `&u32`
+   |
+help: consider dereferencing the borrow
+   |
+LL |     foo3(*u);
+   |          +
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:30:9
+   |
+LL |     foo(&"aaa".to_owned());
+   |         ^^^^^^^^^^^^^^^^^ expected struct `String`, found `&String`
+   |
+help: consider removing the borrow
+   |
+LL -     foo(&"aaa".to_owned());
+LL +     foo("aaa".to_owned());
+   | 
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:32:9
+   |
+LL |     foo(&mut "aaa".to_owned());
+   |         ^^^^^^^^^^^^^^^^^^^^^ expected struct `String`, found `&mut String`
+   |
+help: consider removing the borrow
+   |
+LL -     foo(&mut "aaa".to_owned());
+LL +     foo("aaa".to_owned());
+   | 
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:2:20
+   |
+LL |     ($x:expr) => { &$x }
+   |                    ^^^ expected `u32`, found `&{integer}`
+...
+LL |     foo3(borrow!(0));
+   |          ---------- in this macro invocation
+   |
+   = note: this error originates in the macro `borrow` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:36:5
+   |
+LL |     assert_eq!(3i32, &3i32);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^ expected `i32`, found `&i32`
+   |
+   = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:39:17
+   |
+LL |     let s = S { u };
+   |                 ^
+   |                 |
+   |                 expected `&u32`, found integer
+   |                 help: consider borrowing here: `u: &u`
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:41:20
+   |
+LL |     let s = S { u: u };
+   |                    ^
+   |                    |
+   |                    expected `&u32`, found integer
+   |                    help: consider borrowing here: `&u`
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:44:17
+   |
+LL |     let r = R { i };
+   |                 ^ expected `u32`, found `&{integer}`
+   |
+help: consider dereferencing the borrow
+   |
+LL |     let r = R { i: *i };
+   |                 ~~~~~
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:46:20
+   |
+LL |     let r = R { i: i };
+   |                    ^ expected `u32`, found `&{integer}`
+   |
+help: consider dereferencing the borrow
+   |
+LL |     let r = R { i: *i };
+   |                    +
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:55:9
+   |
+LL |         b
+   |         ^ expected `i32`, found `&{integer}`
+   |
+help: consider dereferencing the borrow
+   |
+LL |         *b
+   |         +
+
+error[E0308]: mismatched types
+  --> $DIR/deref-suggestion.rs:63:9
+   |
+LL |         b
+   |         ^ expected `i32`, found `&{integer}`
+   |
+help: consider dereferencing the borrow
+   |
+LL |         *b
+   |         +
+
+error[E0308]: `if` and `else` have incompatible types
+  --> $DIR/deref-suggestion.rs:68:12
+   |
+LL |        let val = if true {
+   |   _______________-
+LL |  |         *a
+   |  |         -- expected because of this
+LL |  |     } else if true {
+   |  |____________^
+LL | ||
+LL | ||         b
+LL | ||     } else {
+LL | ||         &0
+LL | ||     };
+   | ||     ^
+   | ||_____|
+   | |______`if` and `else` have incompatible types
+   |        expected `i32`, found `&{integer}`
+
+error: aborting due to 13 previous errors
+
+For more information about this error, try `rustc --explain E0308`.