Save @btime output

New to Julia
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This is asked every other week, so probably we should have it directly in BenchmarkTools:

julia> @eval BenchmarkTools macro btimed(args...)
           _, params = prunekwargs(args...)
           bench, trial, result = gensym(), gensym(), gensym()
           trialmin, trialallocs = gensym(), gensym()
           tune_phase = hasevals(params) ? :() : :($BenchmarkTools.tune!($bench))
           return esc(quote
               local $bench = $BenchmarkTools.@benchmarkable $(args...)
               $BenchmarkTools.warmup($bench)
               $tune_phase
               local $trial, $result = $BenchmarkTools.run_result($bench)
               local $trialmin = $BenchmarkTools.minimum($trial)
               $result, $BenchmarkTools.time($trialmin)
           end)
       end
@btimed (macro with 1 method)

julia> BenchmarkTools.@btimed sin(12.3)
(-0.26323179136580094, 1.41)

(the time is returned in nanoseconds)

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