Tab completion doesn't complete dictionary keys

[staticfloat]

I notice that tab'ing lists possible completions above the infiltrator line, but no amount of tab'ing actually completes a dictionary key:

julia> using Infiltrator
       d = Dict("a very long key" => true)
       @infiltrate
Infiltrating top-level frame

infil> d["a
"a very long key"]
infil> d["a
"a very long key"]
infil> d["a
"a very long key"]
infil>

Whereas this does work at the main REPL.