Local specialization of global function

General Usage
1

Is there a reason why one cannot specialize the global function k within the scope of another function? This is on Julia 0.6.3.

k(a, b) = a + b

function doesnotwork(B)
    k(a) = k(a, B)
    k(1)
end

function doeswork(B)
    f(a) = k(a, B)
    f(1)
end

function doeswork2(B)
    g(a, b) = a + b
    g(a) = g(a, B)
    g(1)
end

The error is

julia> doesnotwork(1)
ERROR: MethodError: no method matching (::#k#1{Int64})(::Int64, ::Int64)
Closest candidates are:
  k(::Any) ...

so it looks like the global k is masked by the local one.