1 files changed, 45 insertions, 0 deletions
diff --git a/src/test/ui/enum-discriminant/repr128.rs b/src/test/ui/enum-discriminant/repr128.rs
new file mode 100644
index 000000000..00021a07b
--- /dev/null
+++ b/src/test/ui/enum-discriminant/repr128.rs
@@ -0,0 +1,45 @@
+// run-pass
+#![feature(repr128, core_intrinsics, discriminant_kind)]
+//~^ WARN the feature `repr128` is incomplete
+
+use std::intrinsics::discriminant_value;
+use std::marker::DiscriminantKind;
+
+#[repr(i128)]
+enum Signed {
+    Zero = 0,
+    Staircase = 0x01_02_03_04_05_06_07_08_09_0a_0b_0c_0d_0e_0f,
+    U64Limit = u64::MAX as i128 + 1,
+    SmallNegative = -1,
+    BigNegative = i128::MIN,
+    Next,
+}
+
+#[repr(u128)]
+enum Unsigned {
+    Zero = 0,
+    Staircase = 0x01_02_03_04_05_06_07_08_09_0a_0b_0c_0d_0e_0f,
+    U64Limit = u64::MAX as u128 + 1,
+    Next,
+}
+
+fn discr<T, U>(v: T, value: U)
+where
+    <T as DiscriminantKind>::Discriminant: PartialEq<U>,
+{
+    assert!(discriminant_value(&v) == value);
+}
+
+fn main() {
+    discr(Signed::Zero, 0);
+    discr(Signed::Staircase, 0x01_02_03_04_05_06_07_08_09_0a_0b_0c_0d_0e_0f);
+    discr(Signed::U64Limit, u64::MAX as i128 + 1);
+    discr(Signed::SmallNegative, -1);
+    discr(Signed::BigNegative, i128::MIN);
+    discr(Signed::Next, i128::MIN + 1);
+
+    discr(Unsigned::Zero, 0);
+    discr(Unsigned::Staircase, 0x01_02_03_04_05_06_07_08_09_0a_0b_0c_0d_0e_0f);
+    discr(Unsigned::U64Limit, u64::MAX as u128 + 1);
+    discr(Unsigned::Next, u64::MAX as u128 + 2);
+}