1 files changed, 54 insertions, 0 deletions
diff --git a/tests/ui/enum-discriminant/discriminant_size.rs b/tests/ui/enum-discriminant/discriminant_size.rs
new file mode 100644
index 000000000..b939a70df
--- /dev/null
+++ b/tests/ui/enum-discriminant/discriminant_size.rs
@@ -0,0 +1,54 @@
+// run-pass
+#![feature(core_intrinsics, repr128)]
+//~^ WARN the feature `repr128` is incomplete
+
+use std::intrinsics::discriminant_value;
+
+enum E1 {
+    A,
+    B,
+}
+
+#[repr(i8)]
+enum E2 {
+    A = 7,
+    B = -2,
+}
+
+#[repr(C)]
+enum E3 {
+    A = 42,
+    B = 100,
+}
+
+#[repr(i128)]
+enum E4 {
+    A = 0x1223_3445_5667_7889,
+    B = -0x1223_3445_5667_7889,
+}
+
+fn main() {
+    let mut target: [isize; 3] = [0, 0, 0];
+    target[1] = discriminant_value(&E1::A);
+    assert_eq!(target, [0, 0, 0]);
+    target[1] = discriminant_value(&E1::B);
+    assert_eq!(target, [0, 1, 0]);
+
+    let mut target: [i8; 3] = [0, 0, 0];
+    target[1] = discriminant_value(&E2::A);
+    assert_eq!(target, [0, 7, 0]);
+    target[1] = discriminant_value(&E2::B);
+    assert_eq!(target, [0, -2, 0]);
+
+    let mut target: [isize; 3] = [0, 0, 0];
+    target[1] = discriminant_value(&E3::A);
+    assert_eq!(target, [0, 42, 0]);
+    target[1] = discriminant_value(&E3::B);
+    assert_eq!(target, [0, 100, 0]);
+
+    let mut target: [i128; 3] = [0, 0, 0];
+    target[1] = discriminant_value(&E4::A);
+    assert_eq!(target, [0, 0x1223_3445_5667_7889, 0]);
+    target[1] = discriminant_value(&E4::B);
+    assert_eq!(target, [0, -0x1223_3445_5667_7889, 0]);
+}