1 files changed, 21 insertions, 0 deletions
diff --git a/tests/mir-opt/const_prop/control_flow_simplification.rs b/tests/mir-opt/const_prop/control_flow_simplification.rs
new file mode 100644
index 000000000..7dbe8e734
--- /dev/null
+++ b/tests/mir-opt/const_prop/control_flow_simplification.rs
@@ -0,0 +1,21 @@
+// unit-test: ConstProp
+// compile-flags: -Zmir-opt-level=1
+
+trait NeedsDrop: Sized {
+    const NEEDS: bool = std::mem::needs_drop::<Self>();
+}
+
+impl<This> NeedsDrop for This {}
+
+// EMIT_MIR control_flow_simplification.hello.ConstProp.diff
+// EMIT_MIR control_flow_simplification.hello.PreCodegen.before.mir
+fn hello<T>(){
+    if <bool>::NEEDS {
+        panic!()
+    }
+}
+
+pub fn main() {
+    hello::<()>();
+    hello::<Vec<()>>();
+}