summaryrefslogtreecommitdiffstats
path: root/tests/ui/enum-discriminant/discriminant_value.rs
diff options
context:
space:
mode:
Diffstat (limited to 'tests/ui/enum-discriminant/discriminant_value.rs')
-rw-r--r--tests/ui/enum-discriminant/discriminant_value.rs82
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);
+}