Cannot pass const(T) to function with ref const(T)

[Steven Schveighoffer]

On 3/13/21 5:24 PM, Andrey wrote:
> Mistake. It says about simple argument:
>> cannot pass rvalue argument `xxxxx` of type `Word!(wstring, wstring)` 
>> to parameter `ref const(Word!(wstring, wstring)) base`
> 
> Function:
>> void _setPastBases(const ref Data item, const ref UsualWord base)

Yeah, D does not allow (without a switch) passing an rvalue (i.e. a 
temporary) into a reference.

There is a preview switch for it, I think -preview=rvaluerefparam

-Steve