Rollup merge of rust-lang#140036 - jieyouxu:ui-cleanup-4, r=compiler-errors

Advent of `tests/ui` (misc cleanups and improvements) [4/N]

Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang#133895.

### Review advice

- Best reviewed commit-by-commit.
- I can squash commits before merge, commits are separate to make it easier to review.

Author: ChrisDenton

tests/ui/amdgpu-require-explicit-cpu.rs

@@ -1,3 +1,5 @@
+//! Smoke test for overloaded compound assignments cross-crate.
+
 //@ run-pass
 //@ aux-build:augmented_assignments.rs
 

tests/ui/auto-instantiate.rs

@@ -1,3 +1,6 @@
+//! Check that overloaded compound assignment operators respect usual borrowck rules and emit
+//! reasonable diagnostics.
+
 use std::ops::AddAssign;
 
 #[derive(Clone)]

tests/ui/augmented-assignments-rpass.rs renamed to tests/ui/binop/augmented-assignment.rs

@@ -1,5 +1,5 @@
 error[E0505]: cannot move out of `x` because it is borrowed
-  --> $DIR/augmented-assignments.rs:17:5
+  --> $DIR/augmented-assignments.rs:20:5
    |
 LL |     let mut x = Int(1);
    |         ----- binding `x` declared here
@@ -10,7 +10,7 @@ LL |     x;
    |     ^ move out of `x` occurs here
 
 error[E0596]: cannot borrow `y` as mutable, as it is not declared as mutable
-  --> $DIR/augmented-assignments.rs:24:5
+  --> $DIR/augmented-assignments.rs:27:5
    |
 LL |     y
    |     ^ cannot borrow as mutable

tests/ui/augmented-assignments-feature-gate-cross.rs renamed to tests/ui/binop/augmented-assignments-cross-crate.rs

@@ -0,0 +1,28 @@
+//! Check that type parameters in generic function arg position and in "nested" return type position
+//! can be inferred on an invocation of the generic function.
+//!
+//! See <https://github.com/rust-lang/rust/issues/45>.
+
+//@ run-pass
+
+#![allow(dead_code)]
+#[derive(Debug)]
+struct Pair<T, U> {
+    a: T,
+    b: U,
+}
+
+struct Triple {
+    x: isize,
+    y: isize,
+    z: isize,
+}
+
+fn f<T, U>(x: T, y: U) -> Pair<T, U> {
+    return Pair { a: x, b: y };
+}
+
+pub fn main() {
+    println!("{}", f(Triple {x: 3, y: 4, z: 5}, 4).a.x);
+    println!("{}", f(5, 6).a);
+}

tests/ui/auxiliary/augmented_assignments.rs renamed to tests/ui/binop/auxiliary/augmented_assignments.rs

@@ -0,0 +1,4 @@
+error: target requires explicitly specifying a cpu with `-C target-cpu`
+
+error: aborting due to 1 previous error
+