1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/enum/enum-discrim-too-small.rs b/src/test/ui/enum/enum-discrim-too-small.rs
new file mode 100644
index 000000000..e49841402
--- /dev/null
+++ b/src/test/ui/enum/enum-discrim-too-small.rs
@@ -0,0 +1,38 @@
+#[repr(u8)]
+enum Eu8 {
+    Au8 = 23,
+    Bu8 = 223,
+    Cu8 = -23,
+    //~^ ERROR cannot apply unary operator `-` to type `u8`
+}
+
+#[repr(u16)]
+enum Eu16 {
+    Au16 = 23,
+    Bu16 = 55555,
+    Cu16 = -22333,
+    //~^ ERROR cannot apply unary operator `-` to type `u16`
+}
+
+#[repr(u32)]
+enum Eu32 {
+    Au32 = 23,
+    Bu32 = 3_000_000_000,
+    Cu32 = -2_000_000_000,
+    //~^ ERROR cannot apply unary operator `-` to type `u32`
+}
+
+#[repr(u64)]
+enum Eu64 {
+    Au32 = 23,
+    Bu32 = 3_000_000_000,
+    Cu32 = -2_000_000_000,
+    //~^ ERROR cannot apply unary operator `-` to type `u64`
+}
+
+// u64 currently allows negative numbers, and i64 allows numbers greater than `1<<63`.  This is a
+// little counterintuitive, but since the discriminant can store all the bits, and extracting it
+// with a cast requires specifying the signedness, there is no loss of information in those cases.
+// This also applies to isize and usize on 64-bit targets.
+
+pub fn main() { }