From 582a17101dd0ba337f27d4a09feae1a0af6cc1e3 Mon Sep 17 00:00:00 2001
From: Bastian Kauschke <bastian_kauschke@hotmail.de>
Date: Wed, 27 Jan 2021 12:21:19 +0100
Subject: [PATCH] add const_evaluatable_checked test

---
 .../elaborate-trait-pred.rs                   | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 src/test/ui/const-generics/const_evaluatable_checked/elaborate-trait-pred.rs

diff --git a/src/test/ui/const-generics/const_evaluatable_checked/elaborate-trait-pred.rs b/src/test/ui/const-generics/const_evaluatable_checked/elaborate-trait-pred.rs
new file mode 100644
index 0000000000000..4a4fd1e33117f
--- /dev/null
+++ b/src/test/ui/const-generics/const_evaluatable_checked/elaborate-trait-pred.rs
@@ -0,0 +1,24 @@
+// run-pass
+// Test that we use the elaborated predicates from traits
+// to satisfy const evaluatable predicates.
+#![feature(const_generics, const_evaluatable_checked)]
+#![allow(incomplete_features)]
+use std::mem::size_of;
+
+trait Foo: Sized
+where
+    [(); size_of::<Self>()]: Sized,
+{
+}
+
+impl Foo for u64 {}
+impl Foo for u32 {}
+
+fn foo<T: Foo>() -> [u8; size_of::<T>()] {
+    [0; size_of::<T>()]
+}
+
+fn main() {
+    assert_eq!(foo::<u32>(), [0; 4]);
+    assert_eq!(foo::<u64>(), [0; 8]);
+}