Macros don't seem to work?

Glad to hear. That’s the stantard incantation from the REPL. I don’t use Juno so can’t say with authority, but I’d be surprised if it were different there.

julia> Pkg.add("Query")
julia> Pkg.update()
julia> using Query
julia> @which 4!=3
!=(x, y) in Base at operators.jl:129