Julia 0.7 version

[dfdx]

For anyone interested: in Julia 0.7 there's no more need in unfusing hack, instead one can overload broadcasting directly. The relevant section of manual is here. The shortest and simplest way to prevent fusion is to overload Broadcast.broadcasted (note -ed) method, e.g. for some custom type TrackedArray:

function Broadcast.broadcasted(::typeof(+), x::TrackedArray, y::TrackedArray)
    # do whatever you need
    return TrackedArray(...)   # eagerly return a new object, avoiding lazy fusion
end