rob thijssen
8e882c0757
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Two cuda-feature-only build errors only the CI runner catches:
1. cudarc::nccl::NcclError doesn't impl Display in 0.19.x, so the
`format!("...: {e}")` map_err calls fail to compile when the cuda
feature actually wires them up. Switch every NcclError-typed `{e}`
in nccl_state.rs to `{e:?}` — surfaces variant + ncclResult code
in the same diagnostic shape just via Debug instead of Display.
2. cudarc::CudaStream::memcpy_stod / memcpy_dtov are deprecated in
0.19.7 in favour of clone_htod / clone_dtoh. The replacements
take/return the same types, so the swap is mechanical.
Dev box can't compile with --features cuda (no nvcc), so these only
surface in the build-prerelease CUDA matrix jobs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>