1 files changed, 42 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-15523.rs b/src/test/ui/issues/issue-15523.rs
new file mode 100644
index 000000000..220a34b9b
--- /dev/null
+++ b/src/test/ui/issues/issue-15523.rs
@@ -0,0 +1,42 @@
+// run-pass
+// Issue 15523: derive(PartialOrd) should use the provided
+// discriminant values for the derived ordering.
+//
+// This is checking the basic functionality.
+
+#[derive(PartialEq, PartialOrd)]
+enum E1 {
+    Pos2 = 2,
+    Neg1 = -1,
+    Pos1 = 1,
+}
+
+#[derive(PartialEq, PartialOrd)]
+#[repr(u8)]
+enum E2 {
+    Pos2 = 2,
+    PosMax = !0 as u8,
+    Pos1 = 1,
+}
+
+#[derive(PartialEq, PartialOrd)]
+#[repr(i8)]
+enum E3 {
+    Pos2 = 2,
+    Neg1 = -1_i8,
+    Pos1 = 1,
+}
+
+fn main() {
+    assert!(E1::Pos2 > E1::Pos1);
+    assert!(E1::Pos1 > E1::Neg1);
+    assert!(E1::Pos2 > E1::Neg1);
+
+    assert!(E2::Pos2 > E2::Pos1);
+    assert!(E2::Pos1 < E2::PosMax);
+    assert!(E2::Pos2 < E2::PosMax);
+
+    assert!(E3::Pos2 > E3::Pos1);
+    assert!(E3::Pos1 > E3::Neg1);
+    assert!(E3::Pos2 > E3::Neg1);
+}