I downloaded druntime from https://github.com/xomboverlord/xomb-bare-bones/tree/master. It's druntime made for bare bones XOmB OS. If I want to compile it to object files, dmd return error "undefined identifier _xopEquals". Then I was look to official druntime and I found function _xopEquals. When I add this function to XOmB druntime, nothing changed...
I found this function in druntime/src/object_.d :
bool _xopEquals(in void*, in void*)
{
throw new Error("TypeInfo.equals is not implemented");
}
And I add it to module where DMD invoke the error.