From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:19:13 +0200
Subject: Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../specialization/specialization-default-types.rs | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 tests/ui/specialization/specialization-default-types.rs

(limited to 'tests/ui/specialization/specialization-default-types.rs')

diff --git a/tests/ui/specialization/specialization-default-types.rs b/tests/ui/specialization/specialization-default-types.rs
new file mode 100644
index 000000000..346471f11
--- /dev/null
+++ b/tests/ui/specialization/specialization-default-types.rs
@@ -0,0 +1,35 @@
+// It should not be possible to use the concrete value of a defaulted
+// associated type in the impl defining it -- otherwise, what happens
+// if it's overridden?
+
+#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
+
+trait Example {
+    type Output;
+    fn generate(self) -> Self::Output;
+}
+
+impl<T> Example for T {
+    default type Output = Box<T>;
+    default fn generate(self) -> Self::Output {
+        Box::new(self) //~ ERROR mismatched types
+    }
+}
+
+impl Example for bool {
+    type Output = bool;
+    fn generate(self) -> bool { self }
+}
+
+fn trouble<T>(t: T) -> Box<T> {
+    Example::generate(t) //~ ERROR mismatched types
+}
+
+fn weaponize() -> bool {
+    let b: Box<bool> = trouble(true);
+    *b
+}
+
+fn main() {
+    weaponize();
+}
-- 
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