Re: MSVC warnings when compiling Lua as C++

> Hi, I feel like this topic is brought up every so often and not like it's majorly urgent, but I'll just throw it here.
> 
> As of the current latest commit (7579fc9d7ed90240487251dfb69168f8e64e9294), there's the following warnings when compiling Lua as C++ with MSVC:
> 
> 1>...\lua\lgc.c(488,21): warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)
[...]
> 
> And my 2 cents for the patch; in lobject.h on line 829:
> 
> -#define twoto(x)	(1u<<(x))
> +#define twoto(x)	(1ull<<(x))
> 
> This change results in these warnings disappearing.

The point is that we do want a 32-bit shift. This warning seems to be a
bug: In all those warnings, the result of the shift is being explicitly
casted to size_t, which I believe is 64 bits. (Or not??) So, there is no
"implicit" conversion to 64 bits.

We really don't know how to silence this warning without worsening the
code.

-- Roberto

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