bring back test case

thunder/tests/test_inplace_copy.py

@@ -5,6 +5,7 @@
 from torch.testing import assert_close, make_tensor
 
 import thunder
+from thunder.core import prims
 import thunder.core.dtypes as datatypes
 import thunder.torch as ttorch
 from thunder.tests.framework import instantiate, nvFuserExecutor
@@ -152,3 +153,29 @@ def func3(x, y):
             match=r"If you are sure you don't want to use this check, it can be disabled by setting `disable_inplace_copy_check=True` in `thunder.jit`.$",
         ):
             traced_foo(a, b)
+
+
+@instantiate(executors=(nvFuserExecutor,), dtypes=(thunder.float32,))	
+def test_inplace_copy_dst_copy_returned_issue_1109(executor, device, dtype):	
+    def func(T0):	
+        T1 = torch.sin(T0)	
+        prims.copy_(T1, T0)
+        T2 = torch.cos(T1)
+        prims.copy_(T2, T0)
+        # T1 & T2 should be returned as separate buffer, instead of sharing	
+        # storage with T0	
+        return T1, T2	
+
+    tdtype = ttorch.to_torch_dtype(dtype)	
+    # This pattern is unsafe in general. Disabling sanity check to silence	
+    # exception for testing	
+    traced_foo = executor.make_callable(func, disable_inplace_copy_check=True)	
+    a = make_tensor((4, 4), device=device, dtype=tdtype)	
+    a_ref = a.clone()	
+
+    o_thunder = traced_foo(a)	
+    o_eager = func(a_ref)	
+
+    assert_close(a_ref, a)	
+    for o, o_ref in zip(o_thunder, o_eager):	
+        assert_close(o, o_ref)