Fix CCCL_THROW in dlpack_to_mdspan (#7363) (#7233)

Co-authored-by: Federico Busato <50413820+fbusato@users.noreply.github.com>

Author: gonidelis

thrust/thrust/detail/allocator/temporary_allocator.h

@@ -33,6 +33,7 @@
 #include <thrust/memory.h>
 #include <thrust/system/detail/bad_alloc.h>
 
+#include <cuda/std/__exception/exception_macros.h>
 #include <cuda/std/__memory/allocator_traits.h>
 #include <cuda/std/__utility/pair.h>
 #include <cuda/std/cassert>
@@ -99,7 +100,21 @@ class temporary_allocator : public thrust::detail::tagged_allocator<T, System, t
 
   _CCCL_HOST_DEVICE void deallocate(pointer p, size_type n) noexcept
   {
-    return thrust::return_temporary_buffer(system(), p, n);
+    _CCCL_TRY
+    {
+      thrust::return_temporary_buffer(system(), p, n);
+    }
+    _CCCL_CATCH_ALL
+    {
+      _CCCL_ASSERT(false, "Exception thrown in deallocate");
+      // Swallow all exceptions to maintain noexcept contract per C++ allocator requirements.
+      // Deallocate must be noexcept to be safe in destructors and during exception unwinding.
+      // Clear CUDA error state and leak the memory rather than propagating exception.
+      // Memory is leaked, but this matches standard allocator behavior when deallocation fails.
+#if _CCCL_CUDA_COMPILATION()
+      NV_IF_TARGET(NV_IS_HOST, cudaGetLastError();)
+#endif // _CCCL_CUDA_COMPILATION()
+    }
   }
 
   _CCCL_HOST_DEVICE inline System& system()