1 files changed, 82 insertions, 0 deletions
diff --git a/tests/ui/enum-discriminant/discriminant_value.rs b/tests/ui/enum-discriminant/discriminant_value.rs
new file mode 100644
index 000000000..f3dfac298
--- /dev/null
+++ b/tests/ui/enum-discriminant/discriminant_value.rs
@@ -0,0 +1,82 @@
+// run-pass
+#![allow(stable_features)]
+#![feature(core, core_intrinsics)]
+
+extern crate core;
+use core::intrinsics::discriminant_value;
+
+enum CLike1 {
+    A,
+    B,
+    C,
+    D
+}
+
+enum CLike2 {
+    A = 5,
+    B = 2,
+    C = 19,
+    D
+}
+
+#[repr(i8)]
+enum CLike3 {
+    A = 5,
+    B,
+    C = -1,
+    D
+}
+
+#[allow(unused_tuple_struct_fields)]
+enum ADT {
+    First(u32, u32),
+    Second(u64)
+}
+
+enum NullablePointer {
+    Something(#[allow(unused_tuple_struct_fields)] &'static u32),
+    Nothing
+}
+
+static CONST : u32 = 0xBEEF;
+
+#[allow(dead_code)]
+#[repr(isize)]
+enum Mixed {
+    Unit = 3,
+    Tuple(u16) = 2,
+    Struct {
+        a: u8,
+        b: u16,
+    } = 1,
+}
+
+pub fn main() {
+    assert_eq!(discriminant_value(&CLike1::A), 0isize);
+    assert_eq!(discriminant_value(&CLike1::B), 1);
+    assert_eq!(discriminant_value(&CLike1::C), 2);
+    assert_eq!(discriminant_value(&CLike1::D), 3);
+
+    assert_eq!(discriminant_value(&CLike2::A), 5isize);
+    assert_eq!(discriminant_value(&CLike2::B), 2);
+    assert_eq!(discriminant_value(&CLike2::C), 19);
+    assert_eq!(discriminant_value(&CLike2::D), 20);
+
+    assert_eq!(discriminant_value(&CLike3::A), 5i8);
+    assert_eq!(discriminant_value(&CLike3::B), 6);
+    assert_eq!(discriminant_value(&CLike3::C), -1);
+    assert_eq!(discriminant_value(&CLike3::D), 0);
+
+    assert_eq!(discriminant_value(&ADT::First(0,0)), 0isize);
+    assert_eq!(discriminant_value(&ADT::Second(5)), 1);
+
+    assert_eq!(discriminant_value(&NullablePointer::Nothing), 1isize);
+    assert_eq!(discriminant_value(&NullablePointer::Something(&CONST)), 0);
+
+    assert_eq!(discriminant_value(&10), 0u8);
+    assert_eq!(discriminant_value(&"test"), 0u8);
+
+    assert_eq!(discriminant_value(&Mixed::Unit), 3isize);
+    assert_eq!(discriminant_value(&Mixed::Tuple(5)), 2);
+    assert_eq!(discriminant_value(&Mixed::Struct{a: 7, b: 11}), 1);
+}