1 files changed, 21 insertions, 0 deletions
diff --git a/tests/ui/consts/const-endianess.rs b/tests/ui/consts/const-endianess.rs
new file mode 100644
index 000000000..936f31954
--- /dev/null
+++ b/tests/ui/consts/const-endianess.rs
@@ -0,0 +1,21 @@
+// run-pass
+#![feature(test)]
+
+extern crate test;
+use test::black_box as b; // prevent promotion of the argument and const-propagation of the result
+
+const BE_U32: u32 = 55u32.to_be();
+const LE_U32: u32 = 55u32.to_le();
+
+fn main() {
+    assert_eq!(BE_U32, b(55u32).to_be());
+    assert_eq!(LE_U32, b(55u32).to_le());
+
+    #[cfg(not(target_os = "emscripten"))]
+    {
+        const BE_U128: u128 = 999999u128.to_be();
+        const LE_I128: i128 = (-999999i128).to_le();
+        assert_eq!(BE_U128, b(999999u128).to_be());
+        assert_eq!(LE_I128, b(-999999i128).to_le());
+    }
+}