From 0a25deacbb059f0a099753f4da410b531715b224 Mon Sep 17 00:00:00 2001
From: dianne <diannes.gm@gmail.com>
Date: Tue, 26 Aug 2025 09:09:25 -0700
Subject: [PATCH 1/2] clean up and properly test temporary lifetime extension
 in doctests

- Removes an unused trait and impl from the successful tests.
- Adds uses following all tests so they test lifetime extension.
---
 src/destructors.md | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/destructors.md b/src/destructors.md
index 36e0fe1ed..24ed38e2f 100644
--- a/src/destructors.md
+++ b/src/destructors.md
@@ -448,15 +448,18 @@ Here are some examples where expressions have extended temporary scopes:
 
 ```rust
 # fn temp() {}
-# trait Use { fn use_temp(&self) -> &Self { self } }
-# impl Use for () {}
 // The temporary that stores the result of `temp()` lives in the same scope
 // as x in these cases.
 let x = &temp();
+# x;
 let x = &temp() as &dyn Send;
+# x;
 let x = (&*&temp(),);
+# x;
 let x = { [Some(&temp()) ] };
+# x;
 let ref x = temp();
+# x;
 let ref x = *&temp();
 # x;
 ```
@@ -471,6 +474,7 @@ Here are some examples where expressions don't have extended temporary scopes:
 // end of the let statement in these cases.
 
 let x = std::convert::identity(&temp()); // ERROR
+# x;
 let x = (&temp()).use_temp();  // ERROR
 # x;
 ```

From e5ff66ddac7a944cb4381720ca18bc10b932296d Mon Sep 17 00:00:00 2001
From: dianne <diannes.gm@gmail.com>
Date: Tue, 26 Aug 2025 09:14:45 -0700
Subject: [PATCH 2/2] specify lifetime extension of `match` arms and `if` tail
 expressions

---
 src/destructors.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/destructors.md b/src/destructors.md
index 24ed38e2f..6d6226d35 100644
--- a/src/destructors.md
+++ b/src/destructors.md
@@ -435,6 +435,8 @@ expression which is one of the following:
   expression.
 * The arguments to an extending [tuple struct] or [tuple variant] constructor expression.
 * The final expression of any extending [block expression].
+* The arm(s) of an extending [`match`] expression.
+* The final expressions of an extending [`if`] expression's consequent, `else if`, and `else` blocks.
 
 So the borrow expressions in `&mut 0`, `(&1, &mut 2)`, and `Some(&mut 3)`
 are all extending expressions. The borrows in `&0 + &1` and `f(&mut 0)` are not.
@@ -458,6 +460,10 @@ let x = (&*&temp(),);
 # x;
 let x = { [Some(&temp()) ] };
 # x;
+let x = match () { _ => &temp() };
+# x;
+let x = if true { &temp() } else { &temp() };
+# x;
 let ref x = temp();
 # x;
 let ref x = *&temp();
@@ -477,6 +483,8 @@ let x = std::convert::identity(&temp()); // ERROR
 # x;
 let x = (&temp()).use_temp();  // ERROR
 # x;
+let x = match &temp() { x => x }; // ERROR
+# x;
 ```
 
 r[destructors.forget]