That did work - thank you, see code below.  To explain: this came from a 
bottleneck in a bigger code, so my problem there must be a different one.
  -- Christoph

function testtime()
    a1 = rand(10, 10, 100, 100)
    b1 = rand(10, 100, 100)
    c1 = rand(10, 100, 100)
    d1 = []
    const a2 = rand(10,10,100,100)
    const b2 = rand(10,100,100)
    const c2 = rand(10,100,100)
    d2 = []
    @time(begin
        for n = 1:10
            d1 = [ a1[a,b,i,j] .* b1[a,i,j] .* c1[b,i,j] for a = 1:10, b = 
1:10, i=1:100,j=1:100 ]
        end
    end)
    println(typeof(d1))
    @time(begin
        for n = 1:10
            d2 = [ a2[a,b,i,j] .* b2[a,i,j] .* c2[b,i,j] for a = 1:10, b = 
1:10, i=1:100,j=1:100 ]
        end
    end)
    println(typeof(d2))
end

testtime()



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