proc callFunc(self: FuncRef; variantArgs: varargs[Variant]): Variant {.
gcsafe,
    locks: 0, raises: [CallError, ValueError], tags: []
.}

proc setInstance(self: FuncRef; instance: Object) {.
gcsafe, locks: 0, raises: [], tags: []
.}

proc setFunction(self: FuncRef; name: string) {.
gcsafe, locks: 0, raises: [], tags: []
.}