Function count_instructions 

pub fn count_instructions<F, T, C>(f: F, counter: C) -> Result<T>
where
    F: FnOnce() -> T,
    C: FnMut(&Instruction) + Send,

Runs the function being tested, calling a counter function for each instruction executed.

The counter will be called once for each instruction executed while running f. Note that counter might be called a few more times, immediately before and after running f, due to a few extra instructions necessary to start the trace, copy the result, and stop the trace.

See the top-level crate documentation for examples.