var encoding/json/internal/jsonopts.JoinUnknownOption

3 uses

	encoding/json/internal/jsonopts (current package)
		options.go#L125: var JoinUnknownOption = func(Struct, Options) Struct { panic("unknown option") }
		options.go#L178: 			*dst = JoinUnknownOption(*dst, src)

	encoding/json/v2
		options.go#L291: 	jsonopts.JoinUnknownOption = func(dst jsonopts.Struct, src jsonopts.Options) jsonopts.Struct {