Unary "-" operation for typed relative coordinates missing about cataclysm-dda HOT 2 OPEN

I tried to do it myself by copying and adjusting the "-=" operator in coordinates.h, but that blew up substantially with messages of "'r': identifier not found" in coordinates.h from every existing usage of the binary "-" operator.

You got this on a branch? I might be able to put something together.

from cataclysm-dda.

No, but I tried to quickly recreate it, although it's not quite the same, but still failing:
I entered this into coordinates.h:

template<typename Point, origin relative, scale Scale>
constexpr inline coord_point<Point, origin::relative, Scale>& operator-(coord_point<Point, origin::relative, Scale>
    & me )
{
    me.raw() = -me.raw();
    return me;
}

that compiles. However, trying to use it by adding:

    tripoint_rel_ms alpha = { 1, 2, 3 };
    tripoint_rel_ms beta = -alpha;

to a "random" location such as the top of mapgen.cpp operation add_spawn causes the editor to think it's OK, but the compiler to reject it with
"Severity Code Description Project File Line Suppression State Details
Error C2675 unary '-': 'tripoint_rel_ms' does not define this operator or a conversion to a type acceptable to the predefined operator Cataclysm-lib-vcpkg-static C:\Cataclysm-DDA\src\mapgen.cpp 6807"
and
"Severity Code Description Project File Line Suppression State Details
Error C2088 built-in operator '-' cannot be applied to an operand of type 'tripoint_rel_ms' Cataclysm-lib-vcpkg-static C:\Cataclysm-DDA\src\mapgen.cpp 6807"
where 6807 is the line on which beta is defined.

from cataclysm-dda.