1 files changed, 31 insertions, 0 deletions
diff --git a/tests/mir-opt/separate_const_switch.rs b/tests/mir-opt/separate_const_switch.rs
new file mode 100644
index 000000000..c809e5629
--- /dev/null
+++ b/tests/mir-opt/separate_const_switch.rs
@@ -0,0 +1,31 @@
+#![feature(control_flow_enum)]
+#![feature(try_trait_v2)]
+
+use std::ops::ControlFlow;
+
+// EMIT_MIR separate_const_switch.too_complex.SeparateConstSwitch.diff
+fn too_complex(x: Result<i32, usize>) -> Option<i32> {
+    // The pass should break the outer match into
+    // two blocks that only have one parent each.
+    // Parents are one of the two branches of the first
+    // match, so a later pass can propagate constants.
+    match {
+        match x {
+            Ok(v) => ControlFlow::Continue(v),
+            Err(r) => ControlFlow::Break(r),
+        }
+    } {
+        ControlFlow::Continue(v) => Some(v),
+        ControlFlow::Break(r) => None,
+    }
+}
+
+// EMIT_MIR separate_const_switch.identity.SeparateConstSwitch.diff
+fn identity(x: Result<i32, i32>) -> Result<i32, i32> {
+    Ok(x?)
+}
+
+fn main() {
+    too_complex(Ok(0));
+    identity(Ok(0));
+}