Jiaming Yuan 218a5fb6dd
Simplify Span checks. (#6685)
* Stop printing out message.
* Remove R specialization.

The printed message is not really useful anyway, without a reproducible example
there's no way to fix it.  But if there's a reproducible example, we can always
obtain these information by a debugger.  Removing the `printf` function avoids
creating the context in kernel.
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