1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/structs-enums/small-enum-range-edge.rs b/src/test/ui/structs-enums/small-enum-range-edge.rs
new file mode 100644
index 000000000..306129479
--- /dev/null
+++ b/src/test/ui/structs-enums/small-enum-range-edge.rs
@@ -0,0 +1,27 @@
+// run-pass
+#![allow(non_upper_case_globals)]
+
+// Tests the range assertion wraparound case when reading discriminants.
+
+#[repr(u8)]
+#[derive(Copy, Clone)]
+enum Eu { Lu = 0, Hu = 255 }
+
+static CLu: Eu = Eu::Lu;
+static CHu: Eu = Eu::Hu;
+
+#[repr(i8)]
+#[derive(Copy, Clone)]
+enum Es { Ls = -128, Hs = 127 }
+
+static CLs: Es = Es::Ls;
+static CHs: Es = Es::Hs;
+
+pub fn main() {
+    assert_eq!((Eu::Hu as u8).wrapping_add(1), Eu::Lu as u8);
+    assert_eq!((Es::Hs as i8).wrapping_add(1), Es::Ls as i8);
+    assert_eq!(CLu as u8, Eu::Lu as u8);
+    assert_eq!(CHu as u8, Eu::Hu as u8);
+    assert_eq!(CLs as i8, Es::Ls as i8);
+    assert_eq!(CHs as i8, Es::Hs as i8);
+}