1 files changed, 30 insertions, 0 deletions
diff --git a/tests/mir-opt/simplify_duplicate_unreachable_blocks.rs b/tests/mir-opt/simplify_duplicate_unreachable_blocks.rs
new file mode 100644
index 000000000..e2578407f
--- /dev/null
+++ b/tests/mir-opt/simplify_duplicate_unreachable_blocks.rs
@@ -0,0 +1,30 @@
+#![feature(custom_mir, core_intrinsics)]
+#![crate_type = "lib"]
+
+use std::intrinsics::mir::*;
+
+// unit-test: SimplifyCfg-after-uninhabited-enum-branching
+
+// EMIT_MIR simplify_duplicate_unreachable_blocks.assert_nonzero_nonmax.SimplifyCfg-after-uninhabited-enum-branching.diff
+#[custom_mir(dialect = "runtime", phase = "post-cleanup")]
+pub unsafe fn assert_nonzero_nonmax(x: u8) -> u8 {
+    mir!(
+        {
+            match x {
+                0 => unreachable1,
+                u8::MAX => unreachable2,
+                _ => retblock,
+            }
+        }
+        unreachable1 = {
+            Unreachable()
+        }
+        unreachable2 = {
+            Unreachable()
+        }
+        retblock = {
+            RET = x;
+            Return()
+        }
+    )
+}