Rollup merge of #157737 - zedddie:gsoc-batch-7-meow, r=Teapot4195

Reorganize `tests/ui/issues` [7/N]

Part of [GSoC'26 project](https://rust-lang.zulipchat.com/#narrow/channel/421156-gsoc/topic/Project.3A.20Reorganizing.20tests.2Fui.2Fissues)

r? Kivooeo
@Teapot4195

tests/ui/derives/hash-on-compound-types.rs

@@ -1,3 +1,5 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/21402>.
+
 //@ check-pass
 #![allow(dead_code)]
 

tests/ui/derives/ufcs-in-derive-hash.rs

@@ -0,0 +1,14 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/21160>.
+//! Ensure we don't use existing hash method internally in hash derive.
+
+struct Bar;
+
+impl Bar {
+    fn hash<T>(&self, _: T) {}
+}
+
+#[derive(Hash)]
+struct Foo(Bar);
+//~^ error: `Bar: Hash` is not satisfied
+
+fn main() {}

tests/ui/derives/ufcs-in-derive-hash.stderr

@@ -1,5 +1,5 @@
 error[E0277]: the trait bound `Bar: Hash` is not satisfied
-  --> $DIR/issue-21160.rs:8:12
+  --> $DIR/ufcs-in-derive-hash.rs:11:12
    |
 LL | #[derive(Hash)]
    |          ---- in this derive macro expansion

tests/ui/inference/iter-ufcs-coercion-type-unification.rs

@@ -1,9 +1,11 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/21245>.
+//!
+//! Check that we are able to infer the types in these examples correctly.
+//! It used to be that insufficient type propagation caused the type of the
+//! iterator to be incorrectly unified with the `*const` type to which it is coerced.
+
 //@ check-pass
 #![allow(dead_code)]
-// Regression test for issue #21245. Check that we are able to infer
-// the types in these examples correctly. It used to be that
-// insufficient type propagation caused the type of the iterator to be
-// incorrectly unified with the `*const` type to which it is coerced.
 
 
 use std::ptr;

tests/ui/issues/issue-21140.rs

@@ -1,6 +0,0 @@
-//@ check-pass
-pub trait Trait where Self::Out: std::fmt::Display {
-    type Out;
-}
-
-fn main() {}

tests/ui/issues/issue-21160.rs

@@ -1,11 +0,0 @@
-struct Bar;
-
-impl Bar {
-    fn hash<T>(&self, _: T) {}
-}
-
-#[derive(Hash)]
-struct Foo(Bar);
-//~^ error: `Bar: Hash` is not satisfied
-
-fn main() {}

tests/ui/issues/issue-21202.rs

@@ -1,15 +0,0 @@
-//@ aux-build:issue-21202.rs
-
-extern crate issue_21202 as crate1;
-
-use crate1::A;
-
-mod B {
-    use crate1::A::Foo;
-    fn bar(f: Foo) {
-        Foo::foo(&f);
-        //~^ ERROR: method `foo` is private
-    }
-}
-
-fn main() { }

tests/ui/lifetimes/implicit-lifetime-in-assoc-type-projection.rs

@@ -1,7 +1,8 @@
-// Regression test for #20831: debruijn index account was thrown off
-// by the (anonymous) lifetime in `<Self as Publisher>::Output`
-// below. Note that changing to a named lifetime made the problem go
-// away.
+//! Regression test for <https://github.com/rust-lang/rust/issues/20831>.
+//!
+//! DeBruijn index account was thrown off by the (anonymous) lifetime
+//! in `<Self as Publisher>::Output` below. Note that changing to a
+//! named lifetime made the problem go away.
 
 use std::cell::RefCell;
 use std::ops::{Shl, Shr};

tests/ui/lifetimes/implicit-lifetime-in-assoc-type-projection.stderr

@@ -1,21 +1,21 @@
 error[E0803]: cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements
-  --> $DIR/issue-20831-debruijn.rs:28:33
+  --> $DIR/implicit-lifetime-in-assoc-type-projection.rs:29:33
    |
 LL |     fn subscribe(&mut self, t : Box<dyn Subscriber<Input=<Self as Publisher>::Output> + 'a>) {
    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
 note: first, the lifetime cannot outlive the anonymous lifetime as defined here...
-  --> $DIR/issue-20831-debruijn.rs:28:67
+  --> $DIR/implicit-lifetime-in-assoc-type-projection.rs:29:67
    |
 LL |     fn subscribe(&mut self, t : Box<dyn Subscriber<Input=<Self as Publisher>::Output> + 'a>) {
    |                                                                   ^^^^^^^^^
 note: ...but the lifetime must also be valid for the lifetime `'a` as defined here...
-  --> $DIR/issue-20831-debruijn.rs:26:6
+  --> $DIR/implicit-lifetime-in-assoc-type-projection.rs:27:6
    |
 LL | impl<'a> Publisher<'a> for MyStruct<'a> {
    |      ^^
 note: ...so that the types are compatible
-  --> $DIR/issue-20831-debruijn.rs:28:33
+  --> $DIR/implicit-lifetime-in-assoc-type-projection.rs:29:33
    |
 LL |     fn subscribe(&mut self, t : Box<dyn Subscriber<Input=<Self as Publisher>::Output> + 'a>) {
    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -23,7 +23,7 @@ LL |     fn subscribe(&mut self, t : Box<dyn Subscriber<Input=<Self as Publisher
               found `<MyStruct<'_> as Publisher<'_>>`
 
 error: lifetime may not live long enough
-  --> $DIR/issue-20831-debruijn.rs:28:5
+  --> $DIR/implicit-lifetime-in-assoc-type-projection.rs:29:5
    |
 LL | impl<'a> Publisher<'a> for MyStruct<'a> {
    |      -- lifetime `'a` defined here
@@ -35,7 +35,7 @@ LL |     fn subscribe(&mut self, t : Box<dyn Subscriber<Input=<Self as Publisher
    |     requires that `'a` must outlive `'1`
 
 error: lifetime may not live long enough
-  --> $DIR/issue-20831-debruijn.rs:28:5
+  --> $DIR/implicit-lifetime-in-assoc-type-projection.rs:29:5
    |
 LL | impl<'a> Publisher<'a> for MyStruct<'a> {
    |      -- lifetime `'a` defined here

tests/ui/privacy/ufcs-cross-crate.rs

@@ -0,0 +1,18 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/21202>.
+//! Tests cross-crate ufcs doesn't bypass privacy checks.
+//!
+//@ aux-build:ufcs-cross-crate.rs
+
+extern crate ufcs_cross_crate as crate1;
+
+use crate1::A;
+
+mod B {
+    use crate1::A::Foo;
+    fn bar(f: Foo) {
+        Foo::foo(&f);
+        //~^ ERROR: method `foo` is private
+    }
+}
+
+fn main() { }

tests/ui/privacy/ufcs-cross-crate.stderr

@@ -1,10 +1,10 @@
 error[E0624]: method `foo` is private
-  --> $DIR/issue-21202.rs:10:14
+  --> $DIR/ufcs-cross-crate.rs:13:14
    |
 LL |         Foo::foo(&f);
    |              ^^^ private method
    |
-  ::: $DIR/auxiliary/issue-21202.rs:4:9
+  ::: $DIR/auxiliary/ufcs-cross-crate.rs:4:9
    |
 LL |         fn foo(&self) { }
    |         ------------- private method defined here

tests/ui/range/range-implement-clone.rs

@@ -1,3 +1,4 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/21384>.
 //@ run-pass
 
 use ::std::ops::RangeFull;

tests/ui/traits/object/dyn-iter-box-and-ref-impl-iter.rs

@@ -1,3 +1,6 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/20953>.
+//! Ensure both boxed and ref Iterator trait object implement Iterator.
+
 //@ run-pass
 #![allow(unused_mut)]
 #![allow(unused_variables)]

tests/ui/traits/where-clause-on-self-assoc-type.rs

@@ -0,0 +1,9 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/21140>.
+//! Tests we don't ICE on where clauses on self associated type.
+
+//@ check-pass
+pub trait Trait where Self::Out: std::fmt::Display {
+    type Out;
+}
+
+fn main() {}

tests/ui/transmutability/transmute-copy-associated-type.rs

@@ -1,3 +1,5 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/21174>.
+
 //@ check-pass
 #![allow(dead_code)]
 #![allow(unused_variables)]

tests/ui/unboxed-closures/manual-fnonce-impl-wrapper.rs

@@ -1,3 +1,5 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/20544>.
+
 //@ run-pass
 #![feature(unboxed_closures)]
 #![feature(fn_traits)]