I see the same, yet:
julia> r = rand(10^5);
julia> @time test1(r)
0.000246 seconds (7 allocations: 208 bytes)
julia> @time test2(r)
0.001029 seconds (7 allocations: 781.500 KB)
So test1 is efficient, despite the codewarn output. Not sure what's up.
On Thu, Sep 22, 2016 at 2:21 PM, Christoph Ortner <
> I hope that there is something I am missing, or making a mistake in the
> following example:
> r = rand(10)
> test1(r) = sum( t^2 for t in r )
> test2(r)= sum( [t^2 for t in r] )
> @code_warntype test1(r) # return type Any is inferred
> @code_warntype test2(r) # return type Float64 is inferred
> This caused a problem for me, beyond execution speed: I used a generator
> to create the elements for a comprehension, since the type was not inferred
> the zero-element could not be created.
> Is this a known issue?