Setup `@benchmark` inside function: setup not defined

General Usage
4 
julia> let 
           a = rand(10)
           setup = quote
               x = deepcopy($a)
           end
           t1 = @eval @benchmark sum(x) setup=$setup evals=1
       end
BenchmarkTools.Trial: 10000 samples with 1 evaluation.
 Range (min … max):  17.000 ns … 132.000 ns  ┊ GC (min … max): 0.00% … 0.00%
 Time  (median):     26.000 ns               ┊ GC (median):    0.00%
 Time  (mean ± σ):   24.744 ns ±   3.659 ns  ┊ GC (mean ± σ):  0.00% ± 0.00%

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  17 ns           Histogram: frequency by time           30 ns <

 Memory estimate: 0 bytes, allocs estimate: 0.

julia> let 
           a = rand(10)
           @benchmark sum(x) setup=(x = deepcopy($a)) evals=1
       end
BenchmarkTools.Trial: 10000 samples with 1 evaluation.
 Range (min … max):  17.000 ns …  17.739 μs  ┊ GC (min … max): 0.00% … 0.00%
 Time  (median):     24.000 ns               ┊ GC (median):    0.00%
 Time  (mean ± σ):   26.664 ns ± 177.178 ns  ┊ GC (mean ± σ):  0.00% ± 0.00%

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  17 ns           Histogram: frequency by time           30 ns <

 Memory estimate: 0 bytes, allocs estimate: 0.
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