1 files changed, 53 insertions, 0 deletions
diff --git a/tests/ui/structs-enums/enum-discrim-autosizing.rs b/tests/ui/structs-enums/enum-discrim-autosizing.rs
new file mode 100644
index 00000000000..f68fdda6053
--- /dev/null
+++ b/tests/ui/structs-enums/enum-discrim-autosizing.rs
@@ -0,0 +1,53 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(overflowing_literals)]
+
+use std::mem::size_of;
+
+enum Ei8 {
+    Ai8 = -1,
+    Bi8 = 0
+}
+
+enum Eu8 {
+    Au8 = 0,
+    Bu8 = 0x80
+}
+
+enum Ei16 {
+    Ai16 = -1,
+    Bi16 = 0x80
+}
+
+enum Eu16 {
+    Au16 = 0,
+    Bu16 = 0x8000
+}
+
+enum Ei32 {
+    Ai32 = -1,
+    Bi32 = 0x8000
+}
+
+enum Eu32 {
+    Au32 = 0,
+    Bu32 = 0x8000_0000
+}
+
+enum Ei64 {
+    Ai64 = -1,
+    Bi64 = 0x8000_0000
+}
+
+pub fn main() {
+    assert_eq!(size_of::<Ei8>(), 1);
+    assert_eq!(size_of::<Eu8>(), 1);
+    assert_eq!(size_of::<Ei16>(), 2);
+    assert_eq!(size_of::<Eu16>(), 2);
+    assert_eq!(size_of::<Ei32>(), 4);
+    assert_eq!(size_of::<Eu32>(), 4);
+    #[cfg(target_pointer_width = "64")]
+    assert_eq!(size_of::<Ei64>(), 8);
+    #[cfg(target_pointer_width = "32")]
+    assert_eq!(size_of::<Ei64>(), 4);
+}