1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/enum/enum-discrim-autosizing.rs b/src/test/ui/enum/enum-discrim-autosizing.rs
new file mode 100644
index 000000000..27fab1bb5
--- /dev/null
+++ b/src/test/ui/enum/enum-discrim-autosizing.rs
@@ -0,0 +1,14 @@
+// With no repr attribute the discriminant will default to isize.
+// On 32-bit architectures this is equivalent to i32 so the variants
+// collide. On other architectures we need compilation to fail anyway,
+// so force the repr.
+#[cfg_attr(not(target_pointer_width = "32"), repr(i32))]
+enum Eu64 {
+    //~^ ERROR discriminant value `0` assigned more than once
+    Au64 = 0,
+    //~^NOTE first assignment of `0`
+    Bu64 = 0x8000_0000_0000_0000
+    //~^NOTE second assignment of `0` (overflowed from `9223372036854775808`)
+}
+
+fn main() {}