mir-opt: Eliminate dead ref statements

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/mir-opt/dead-store-elimination/ref.tuple.DeadStoreElimination-initial.diff b/tests/mir-opt/dead-store-elimination/ref.tuple.DeadStoreElimination-initial.diff
new file mode 100644
index 00000000000..0547a42cab2
--- /dev/null
+++ b/tests/mir-opt/dead-store-elimination/ref.tuple.DeadStoreElimination-initial.diff
@@ -0,0 +1,26 @@
+- // MIR for `tuple` before DeadStoreElimination-initial
++ // MIR for `tuple` after DeadStoreElimination-initial
+  
+  fn tuple(_1: (i32, &Foo)) -> i32 {
+      debug v => _1;
+      let mut _0: i32;
+      let _2: &i32;
+      let mut _3: &Foo;
+      let mut _4: &Foo;
+      scope 1 {
+          debug _dead => _2;
+      }
+  
+      bb0: {
+          StorageLive(_2);
+          _3 = deref_copy (_1.1: &Foo);
+-         _2 = &((*_3).2: i32);
++         // DBG: _2 = &((*_3).2: i32);
++         nop;
+          _4 = deref_copy (_1.1: &Foo);
+          _0 = copy ((*_4).0: i32);
+          StorageDead(_2);
+          return;
+      }
+  }
+