Make function arguments positional or keyword

General Usage
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14

@mkborregaard @ChrisRackauckas: Here is a workaround to the above problem. Any advice/comments? Thanks a lot.

function tryFunction(; x::Int64=nothing,y::Int64=nothing)
  if x == nothing || y == nothing
    error("Specify arguments")
  end
  tryFunction(x::Int64, y::Int64)
end

function tryFunction(x::Int64,y::Int64)
  return(x + y)
end

tryFunction(x=2,y=7)
tryFunction(2,7)
tryFunction(y=2,x=7)