Preserve NVTX names for lvalue senders (#2204)

* Preserve NVTX names for lvalue senders

* Format NVTX regression test

Author: fallintoplace

include/nvexec/nvtx.cuh

@@ -110,7 +110,7 @@ namespace nv::execution
           static_cast<Self&&>(self).sndr_,
           static_cast<Receiver&&>(rcvr),
           [&](_strm::opstate_base<Receiver>& stream_provider) -> receiver_t<Receiver>
-          { return receiver_t<Receiver>(stream_provider, std::move(self.name_)); });
+          { return receiver_t<Receiver>(stream_provider, static_cast<Self&&>(self).name_); });
       }
       STDEXEC_EXPLICIT_THIS_END(connect)
 

test/nvexec/CMakeLists.txt

@@ -32,6 +32,7 @@ set(nvexec_test_sources
     let_value.cpp
     test_main.cpp
     then.cpp
+    nvtx.cpp
     reduce.cpp
     repeat_n.cpp
     split.cpp

test/nvexec/nvtx.cpp

@@ -0,0 +1,19 @@
+#include <nvexec/nvtx.cuh>
+#include <nvexec/stream_context.cuh>
+#include <stdexec/execution.hpp>
+#include <test_common/catch2.hpp>
+
+namespace ex = STDEXEC;
+
+namespace
+{
+  TEST_CASE("nvexec nvtx preserves names for lvalue senders", "[cuda][stream][nvtx]")
+  {
+    nvexec::stream_context stream_ctx{};
+    auto snd = ex::schedule(stream_ctx.get_scheduler()) | nvexec::nvtx::push("test");
+
+    ex::sync_wait(snd);
+
+    CHECK(snd.name_ == "test");
+  }
+}  // namespace