1 files changed, 21 insertions, 0 deletions
diff --git a/tests/mir-opt/switch_to_self.rs b/tests/mir-opt/switch_to_self.rs
new file mode 100644
index 000000000..6678e4b3b
--- /dev/null
+++ b/tests/mir-opt/switch_to_self.rs
@@ -0,0 +1,21 @@
+// Test that MatchBranchSimplification doesn't ICE on a SwitchInt where
+// one of the targets is the block that the SwitchInt terminates.
+#![crate_type = "lib"]
+#![feature(core_intrinsics, custom_mir)]
+use std::intrinsics::mir::*;
+
+// EMIT_MIR switch_to_self.test.MatchBranchSimplification.diff
+#[custom_mir(dialect = "runtime", phase = "post-cleanup")]
+pub fn test(x: bool) {
+    mir!(
+        {
+            Goto(bb0)
+        }
+        bb0 = {
+            match x { false => bb0, _ => bb1 }
+        }
+        bb1 = {
+            match x { false => bb0, _ => bb1 }
+        }
+    )
+}