Truly automatic benchmarking

[Nordlöw]

Have anybody implemented anything near the expressiveness and 
ease of use of Rust's builtin benchmarking features

https://doc.rust-lang.org/1.16.0/book/benchmark-tests.html

I'm mostly interested in completely automatic printing of results 
such as

test tests::bench_add_two ... bench:         1 ns/iter (+/- 0)

and letting the benchmarking library (like in Rust) itself figure 
out the suitable number of iterations a function should be tested 
based on some heuristics on how long one iteration takes and some 
default upper wall clock time limit.