alternative to do block: start_timing! and stop_timing!

[zot]

Chunk 2 fails if I enclose chunk 1 in a do block.

@timeit "chunk 1" begin
	local var1 = func1()
	local var2 = func2()
	local var3 = func3()
end
@timeit "chunk 2" begin
	compute_with(var1, var2, var3)
end
with_timer("chunk 3") do
   ... lots of other code that uses var1, var2, and var3
end

It'd be nice if I could sometimes time things without a do block:

# code chunk 1
local timer = start_timing!(t, "chunk 1")
local var1 = func1()
local var2 = func2()
local var3 = func3()
stop_timing!(timer)

@timeit "chunk 2" begin
	compute_with(var1, var2, var3)
end
with_timer("chunk 3") do
   ... lots of other code that uses var1, var2, and var3
end

You could do it like below but separate timers are nicer because otherwise you have to restructure your code simply because you are timing it and large numbers of variables make it even more awkward...

local var1, var2, var3 = with_timer("chunk1") do
   func1(), func2(), func3()
end

For throws, if start_timing! happens to be within an outer with_timer block and there's a throw before the stop_timing! call occurs, the outer timing block can clean up the mess.

[zot]

Already implemented by #185