From dc0db358abe19481e475e10c32149b53370f1a1c Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 30 May 2024 05:57:31 +0200
Subject: Merging upstream version 1.72.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 ...st-default-bound-non-const-specialized-bound.rs | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 tests/ui/rfcs/rfc-2632-const-trait-impl/specialization/const-default-bound-non-const-specialized-bound.rs

(limited to 'tests/ui/rfcs/rfc-2632-const-trait-impl/specialization/const-default-bound-non-const-specialized-bound.rs')

diff --git a/tests/ui/rfcs/rfc-2632-const-trait-impl/specialization/const-default-bound-non-const-specialized-bound.rs b/tests/ui/rfcs/rfc-2632-const-trait-impl/specialization/const-default-bound-non-const-specialized-bound.rs
new file mode 100644
index 000000000..f31123f16
--- /dev/null
+++ b/tests/ui/rfcs/rfc-2632-const-trait-impl/specialization/const-default-bound-non-const-specialized-bound.rs
@@ -0,0 +1,58 @@
+// Tests that trait bounds on specializing trait impls must be `~const` if the
+// same bound is present on the default impl and is `~const` there.
+
+#![feature(const_trait_impl)]
+#![feature(rustc_attrs)]
+#![feature(min_specialization)]
+
+#[rustc_specialization_trait]
+trait Specialize {}
+
+#[const_trait]
+trait Foo {}
+
+#[const_trait]
+trait Bar {
+    fn bar();
+}
+
+// bgr360: I was only able to exercise the code path that raises the
+// "missing ~const qualifier" error by making this base impl non-const, even
+// though that doesn't really make sense to do. As seen below, if the base impl
+// is made const, rustc fails earlier with an overlapping impl failure.
+impl<T> Bar for T
+where
+    T: ~const Foo,
+{
+    default fn bar() {}
+}
+
+impl<T> Bar for T
+where
+    T: Foo, //~ ERROR missing `~const` qualifier
+    T: Specialize,
+{
+    fn bar() {}
+}
+
+#[const_trait]
+trait Baz {
+    fn baz();
+}
+
+impl<T> const Baz for T
+where
+    T: ~const Foo,
+{
+    default fn baz() {}
+}
+
+impl<T> const Baz for T //~ ERROR conflicting implementations of trait `Baz`
+where
+    T: Foo,
+    T: Specialize,
+{
+    fn baz() {}
+}
+
+fn main() {}
-- 
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