1 files changed, 34 insertions, 0 deletions
diff --git a/tests/codegen/match-optimizes-away.rs b/tests/codegen/match-optimizes-away.rs
new file mode 100644
index 000000000..8f66c518c
--- /dev/null
+++ b/tests/codegen/match-optimizes-away.rs
@@ -0,0 +1,34 @@
+//
+// no-system-llvm
+// compile-flags: -O
+#![crate_type="lib"]
+
+pub enum Three { A, B, C }
+
+#[repr(u16)]
+pub enum Four { A, B, C, D }
+
+#[no_mangle]
+pub fn three_valued(x: Three) -> Three {
+    // CHECK-LABEL: @three_valued
+    // CHECK-NEXT: {{^.*:$}}
+    // CHECK-NEXT: ret i8 %0
+    match x {
+        Three::A => Three::A,
+        Three::B => Three::B,
+        Three::C => Three::C,
+    }
+}
+
+#[no_mangle]
+pub fn four_valued(x: Four) -> Four {
+    // CHECK-LABEL: @four_valued
+    // CHECK-NEXT: {{^.*:$}}
+    // CHECK-NEXT: ret i16 %0
+    match x {
+        Four::A => Four::A,
+        Four::B => Four::B,
+        Four::C => Four::C,
+        Four::D => Four::D,
+    }
+}