2 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/repr/transparent-enum-too-many-variants.rs b/src/test/ui/repr/transparent-enum-too-many-variants.rs
new file mode 100644
index 00000000000..0dd4b4e6846
--- /dev/null
+++ b/src/test/ui/repr/transparent-enum-too-many-variants.rs
@@ -0,0 +1,10 @@
+use std::mem::size_of;
+
+#[repr(transparent)]
+enum Foo { //~ ERROR E0731
+    A(u8), B(u8),
+}
+
+fn main() {
+    println!("Foo: {}", size_of::<Foo>());
+}
diff --git a/src/test/ui/repr/transparent-enum-too-many-variants.stderr b/src/test/ui/repr/transparent-enum-too-many-variants.stderr
new file mode 100644
index 00000000000..fb44757efaf
--- /dev/null
+++ b/src/test/ui/repr/transparent-enum-too-many-variants.stderr
@@ -0,0 +1,11 @@
+error[E0731]: transparent enum needs exactly one variant, but has 2
+  --> $DIR/transparent-enum-too-many-variants.rs:4:1
+   |
+LL | enum Foo {
+   | ^^^^^^^^ needs exactly one variant, but has 2
+LL |     A(u8), B(u8),
+   |     -      - too many variants in `Foo`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0731`.