From 56efa0a7bf55aa4d1413008df672b95f09a4d8e9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=AE=B8=E6=9D=B0=E5=8F=8B=20Jieyou=20Xu=20=28Joe=29?=
 <39484203+jieyouxu@users.noreply.github.com>
Date: Sun, 8 Dec 2024 22:13:07 +0800
Subject: [PATCH] Adjust `as-precedence.rs`

- Document `as-precedence.rs`
- Move `as-precedence.rs` under `tests/ui/parser/`
---
 tests/ui/as-precedence.rs        | 10 ----------
 tests/ui/parser/as-precedence.rs | 18 ++++++++++++++++++
 2 files changed, 18 insertions(+), 10 deletions(-)
 delete mode 100644 tests/ui/as-precedence.rs
 create mode 100644 tests/ui/parser/as-precedence.rs

diff --git a/tests/ui/as-precedence.rs b/tests/ui/as-precedence.rs
deleted file mode 100644
index 5021a3b677f2..000000000000
--- a/tests/ui/as-precedence.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-//@ run-pass
-
-#[allow(unused_parens)]
-fn main() {
-    assert_eq!(3 as usize * 3, 9);
-    assert_eq!(3 as (usize) * 3, 9);
-    assert_eq!(3 as (usize) / 3, 1);
-    assert_eq!(3 as usize + 3, 6);
-    assert_eq!(3 as (usize) + 3, 6);
-}
diff --git a/tests/ui/parser/as-precedence.rs b/tests/ui/parser/as-precedence.rs
new file mode 100644
index 000000000000..ca8328adb0e7
--- /dev/null
+++ b/tests/ui/parser/as-precedence.rs
@@ -0,0 +1,18 @@
+//! Parser precedence test to help with [RFC 87 "Trait Bounds with Plus"][rfc-87], to check the
+//! precedence of the `as` operator in relation to some arithmetic bin-ops and parentheses.
+//!
+//! Editor's note: this test seems quite incomplete compared to what's possible nowadays. Maybe
+//! there's another set of tests whose coverage overshadows this test?
+//!
+//! [rfc-87]: https://rust-lang.github.io/rfcs/0087-trait-bounds-with-plus.html
+
+//@ run-pass
+
+#[allow(unused_parens)]
+fn main() {
+    assert_eq!(3 as usize * 3, 9);
+    assert_eq!(3 as (usize) * 3, 9);
+    assert_eq!(3 as (usize) / 3, 1);
+    assert_eq!(3 as usize + 3, 6);
+    assert_eq!(3 as (usize) + 3, 6);
+}