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When calling `internal::cast<S, std::complex<T>>(x)`, clang often generates an implicit conversion warning due to an implicit cast from type `S` to `T`. This currently affects the following tests: - `basicstuff` - `bfloat16_float` - `cxx11_tensor_casts` The implicit cast leads to widening/narrowing float conversions. Widening warnings only seem to be generated by clang (`-Wdouble-promotion`). To eliminate the warning, we explicitly cast the real-component first from `S` to `T`. We also adjust tests to use `internal::cast` instead of `static_cast` when a complex type may be involved.