On Sunday, 18 December 2016 at 14:32:08 UTC, kinke wrote:
TypeInfo_Struct apparently requires (or used to require) an `int opCmp(ref const T rhs)` overload, i.e., a version taking the rhs lvalue argument by reference (see https://dlang.org/spec/operatoroverloading.html#compare). Note that there are other overloads afterwards which take the rhs argument by value, thereby allowing rhs rvalues too.
Thank you for your complementary answer and explanation. All these look less strange to me now.
