comments

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/ui/codegen/nested-enum-match-optimization-15793.rs b/tests/ui/codegen/nested-enum-match-optimization-15793.rs
new file mode 100644
index 00000000000..420e3ad82b2
--- /dev/null
+++ b/tests/ui/codegen/nested-enum-match-optimization-15793.rs
@@ -0,0 +1,29 @@
+//! Regression test for https://github.com/rust-lang/rust/issues/15793
+
+//@ run-pass
+#![allow(dead_code)]
+
+enum NestedEnum {
+    First,
+    Second,
+    Third
+}
+enum Enum {
+    Variant1(bool),
+    Variant2(NestedEnum)
+}
+
+#[inline(never)]
+fn foo(x: Enum) -> isize {
+    match x {
+        Enum::Variant1(true) => 1,
+        Enum::Variant1(false) => 2,
+        Enum::Variant2(NestedEnum::Second) => 3,
+        Enum::Variant2(NestedEnum::Third) => 4,
+        Enum::Variant2(NestedEnum::First) => 5
+    }
+}
+
+fn main() {
+    assert_eq!(foo(Enum::Variant2(NestedEnum::Third)), 4);
+}