Strange interaction between DataArrays.jl and Gadfly.jl

[joshbode]

I'm getting a strange error which appears to be an interaction between Gadfly and DataArrays.
Specifically, map! is failing in certain cases, but only when Gadfly is imported.

Here is a simple example (verified using Julia 0.5 on OS X and Linux):

using DataArrays
using Gadfly

function foo{S <: Real, T <: Real}(x::AbstractArray{S}, y::AbstractArray{T})
    result = DataArray(Float64, length(x))
    map!((a, b) -> (isna(a) || isna(b)) ? NA : a + b, result, x, y)
end

function bar{S <: Real, T <: Real}(x::AbstractArray{S}, y::AbstractArray{T})
    result = DataArray(Float64, length(x))
    map!((a, b) -> a + b, result, x, y)
end

I get the following error:

julia> x = DataArray(1:10)
julia> y = DataArray(fill(1.0, 10))
julia> foo(x, y)
ERROR: TypeError: non-boolean (Bool) used in boolean context
 in (::##1#2)(::Int64, ::Float64) at ./REPL[3]:3
 in macro expansion at /Users/josh/.julia/v0.5/DataArrays/src/broadcast.jl:59 [inlined]
 in macro expansion at ./cartesian.jl:64 [inlined]
 in (::DataArrays.#_F_#203)(::DataArrays.DataArray{Float64,1}, ::DataArrays.DataArray{Int64,1}, ::DataArrays.DataArray{Float64,1}) at /Users/josh/.julia/v0.5/DataArrays/src/broadcast.jl:130
 in map!(::Function, ::DataArrays.DataArray{Float64,1}, ::DataArrays.DataArray{Int64,1}, ::DataArrays.DataArray{Float64,1}) at /Users/josh/.julia/v0.5/DataArrays/src/broadcast.jl:214
 in foo(::DataArrays.DataArray{Int64,1}, ::DataArrays.DataArray{Float64,1}) at ./REPL[3]:3

Note: if Gadfly is not loaded, then the call to foo works as expected with out error (I did say the issue was strange!). The error is also present if Gadfly is imported before DataArrays.

Also, the following calls do work, regardless of whether Gadfly is imported:

foo(x, x)
foo(y, y)
foo(y, x)  # ???!!!
bar(x, y)
bar(y, x)
bar(y, y)

So, it may have something to do with type conversion/promotion (or return type inference?), but as for why/how it involves Gadfly, I have no idea!

[joshbode]

If the additional precompilation in Gadfly (see precompile.jl) is disabled, then the error goes away.

[nalimilan]

Isn't that only on Julia 0.6? I think we've seen similar errors related to broadcast in DataArrays tests.

[joshbode]

Closing - this appears to have been addressed in the release-0.5 branch, probably via JuliaLang/julia/pull/18869