1 files changed, 42 insertions, 0 deletions
diff --git a/src/test/run-pass/enum-variant-generic-args.rs b/src/test/run-pass/enum-variant-generic-args.rs
new file mode 100644
index 00000000000..0743f998979
--- /dev/null
+++ b/src/test/run-pass/enum-variant-generic-args.rs
@@ -0,0 +1,42 @@
+#![feature(irrefutable_let_patterns)]
+#![feature(type_alias_enum_variants)]
+
+#![allow(irrefutable_let_patterns)]
+
+#[allow(dead_code)]
+enum Enum<T> { TSVariant(T), SVariant { v: T } }
+type Alias<T> = Enum<T>;
+type AliasFixed = Enum<()>;
+
+macro_rules! is_variant {
+    (TSVariant, $expr:expr) => (is_variant!(@check TSVariant, (_), $expr));
+    (SVariant, $expr:expr) => (is_variant!(@check SVariant, { v: _ }, $expr));
+    (@check $variant:ident, $matcher:tt, $expr:expr) => (
+        assert!(if let Enum::$variant::<()> $matcher = $expr { true } else { false },
+                "expr does not have correct type");
+    );
+}
+
+fn main() {
+    // Tuple struct variant
+
+    is_variant!(TSVariant, Enum::TSVariant(()));
+    is_variant!(TSVariant, Enum::TSVariant::<()>(()));
+    is_variant!(TSVariant, Enum::<()>::TSVariant(()));
+
+    is_variant!(TSVariant, Alias::TSVariant(()));
+    is_variant!(TSVariant, Alias::<()>::TSVariant(()));
+
+    is_variant!(TSVariant, AliasFixed::TSVariant(()));
+
+    // Struct variant
+
+    is_variant!(SVariant, Enum::SVariant { v: () });
+    is_variant!(SVariant, Enum::SVariant::<()> { v: () });
+    is_variant!(SVariant, Enum::<()>::SVariant { v: () });
+
+    is_variant!(SVariant, Alias::SVariant { v: () });
+    is_variant!(SVariant, Alias::<()>::SVariant { v: () });
+
+    is_variant!(SVariant, AliasFixed::SVariant { v: () });
+}