pfib.jl

# run in commit c35d1d7f7c9d90e0a00ded1980d6fcd5d06f5433
# fixed by commit f81d4d21862c99e1c0452bdf2613ab9e20da9935

macro par(expr)
    thunk = esc(:(()->($expr)))
    quote
        local task = Task($thunk)
        task.sticky = false
        schedule(task)
        task
    end
end

function pfib(n::Int)
    if n <= 1
        return n
    end
    t = @par pfib(n-2)
    return pfib(n-1) + fetch(t)::Int
end

pfib(31)