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* Roberto Ierusalimschy:

>> 1) The macro twoto(x) defined as (1<<(x)) in lobject.h gives numerous
>> warnings when building on MSVC for 64 bits platforms.
>> The message is:
>>    warning C4334: '<<' : result of 32-bit shift implicitly converted
>> to 64 bits (was 64-bit shift intended?)
> This is strange. As '1' is an int, the result from the shift should be
> an int, too.

I think it's complaining that you're shifting in 32 bits, and then
using the result only after conversion to 64 bits.  (This probably
comes from the sizenode macro.)  I don't know how commonly this leads
to actual errors in C code, but the warning would have saved me some
momentary puzzlement when writing Java code.