From 36e8c113f67bb793cb231cbf0d29c29c02819b85 Mon Sep 17 00:00:00 2001
From: Deadbeef <ent3rm4n@gmail.com>
Date: Sat, 24 Sep 2022 20:15:19 +0000
Subject: [PATCH] added tests

---
 .../specializing-constness-2.rs               | 31 +++++++++++++++++++
 .../specializing-constness-2.stderr           | 19 ++++++++++++
 .../specializing-constness.rs                 | 26 ++++++++++++++++
 .../specializing-constness.stderr             |  8 +++++
 4 files changed, 84 insertions(+)
 create mode 100644 src/test/ui/rfc-2632-const-trait-impl/specializing-constness-2.rs
 create mode 100644 src/test/ui/rfc-2632-const-trait-impl/specializing-constness-2.stderr
 create mode 100644 src/test/ui/rfc-2632-const-trait-impl/specializing-constness.rs
 create mode 100644 src/test/ui/rfc-2632-const-trait-impl/specializing-constness.stderr

diff --git a/src/test/ui/rfc-2632-const-trait-impl/specializing-constness-2.rs b/src/test/ui/rfc-2632-const-trait-impl/specializing-constness-2.rs
new file mode 100644
index 000000000000..633543700d2e
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/specializing-constness-2.rs
@@ -0,0 +1,31 @@
+#![feature(const_trait_impl, min_specialization, rustc_attrs)]
+
+#[rustc_specialization_trait]
+#[const_trait]
+pub trait Sup {}
+
+impl const Sup for () {}
+
+#[const_trait]
+pub trait A {
+    fn a() -> u32;
+}
+
+impl<T: Default> A for T {
+    default fn a() -> u32 {
+        2
+    }
+}
+
+impl<T: Default + ~const Sup> const A for T {
+    fn a() -> u32 {
+        3
+    }
+}
+
+const fn generic<T: Default>() {
+    <T as A>::a();
+    //~^ ERROR: the trait bound `T: ~const Sup` is not satisfied
+}
+
+fn main() {}
diff --git a/src/test/ui/rfc-2632-const-trait-impl/specializing-constness-2.stderr b/src/test/ui/rfc-2632-const-trait-impl/specializing-constness-2.stderr
new file mode 100644
index 000000000000..c554671e18d8
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/specializing-constness-2.stderr
@@ -0,0 +1,19 @@
+error[E0277]: the trait bound `T: ~const Sup` is not satisfied
+  --> $DIR/specializing-constness-2.rs:27:5
+   |
+LL |     <T as A>::a();
+   |     ^^^^^^^^^^^^^ the trait `~const Sup` is not implemented for `T`
+   |
+note: required for `T` to implement `~const A`
+  --> $DIR/specializing-constness-2.rs:20:37
+   |
+LL | impl<T: Default + ~const Sup> const A for T {
+   |                                     ^     ^
+help: consider further restricting this bound
+   |
+LL | const fn generic<T: Default + ~const Sup>() {
+   |                             ++++++++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.
diff --git a/src/test/ui/rfc-2632-const-trait-impl/specializing-constness.rs b/src/test/ui/rfc-2632-const-trait-impl/specializing-constness.rs
new file mode 100644
index 000000000000..ff0cd489d474
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/specializing-constness.rs
@@ -0,0 +1,26 @@
+#![feature(const_trait_impl, min_specialization, rustc_attrs)]
+
+#[rustc_specialization_trait]
+#[const_trait]
+pub trait Sup {}
+
+impl const Sup for () {}
+
+#[const_trait]
+pub trait A {
+    fn a() -> u32;
+}
+
+impl<T: ~const Default> const A for T {
+    default fn a() -> u32 {
+        2
+    }
+}
+
+impl<T: Default + Sup> A for T { //~ ERROR: cannot specialize
+    fn a() -> u32 {
+        3
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/rfc-2632-const-trait-impl/specializing-constness.stderr b/src/test/ui/rfc-2632-const-trait-impl/specializing-constness.stderr
new file mode 100644
index 000000000000..3296c109c4e7
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/specializing-constness.stderr
@@ -0,0 +1,8 @@
+error: cannot specialize on trait `Default`
+  --> $DIR/specializing-constness.rs:20:9
+   |
+LL | impl<T: Default + Sup> A for T {
+   |         ^^^^^^^
+
+error: aborting due to previous error
+