Add tests.

Author: m-ou-se

tests/ui/lifetimes/temporary-lifetime-extension-tuple-ctor.rs

@@ -0,0 +1,25 @@
+//@ edition:2024
+
+fn temp() -> String {
+    String::from("Hello")
+}
+
+#[derive(Debug)]
+struct X<'a>(&'a String);
+
+fn main() {
+    let a = &temp();
+    let b = Some(&temp());
+    let c = Option::Some::<&String>(&temp());
+    use Option::Some as S;
+    let d = S(&temp());
+    let e = X(&temp());
+    let f = Some(Ok::<_, ()>(std::borrow::Cow::Borrowed(if true {
+        &temp()
+    } else {
+        panic!()
+    })));
+    let some = Some; // Turn the ctor into a regular function.
+    let g = some(&temp()); //~ERROR temporary value dropped while borrowe
+    println!("{a:?} {b:?} {c:?} {d:?} {e:?} {f:?} {g:?}");
+}

tests/ui/lifetimes/temporary-lifetime-extension-tuple-ctor.stderr

@@ -0,0 +1,19 @@
+error[E0716]: temporary value dropped while borrowed
+  --> $DIR/temporary-lifetime-extension-tuple-ctor.rs:23:19
+   |
+LL |     let g = some(&temp());
+   |                   ^^^^^^ - temporary value is freed at the end of this statement
+   |                   |
+   |                   creates a temporary value which is freed while still in use
+LL |     println!("{a:?} {b:?} {c:?} {d:?} {e:?} {f:?} {g:?}");
+   |                                                   ----- borrow later used here
+   |
+help: consider using a `let` binding to create a longer lived value
+   |
+LL ~     let binding = temp();
+LL ~     let g = some(&binding);
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0716`.