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?

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