if len(b.output) > 0 {
				b.trimOutput()
				fmt.Printf("--- BENCH: %s\n%s", benchName, b.output)
			}
			if p := runtime.GOMAXPROCS(-1); p != procs {
				fmt.Fprintf(os.Stderr, "testing: %s left GOMAXPROCS set to %d\n", benchName, p)
			}
		}
	}
}

// trimOutput shortens the output from a benchmark, which can be very long.
func (b *B) trimOutput() {

	func (b *B) run() BenchmarkResult

	// runN runs a single benchmark for the specified number of ...
	func (b *B) runN(n int)

	// trimOutput shortens the output from a benchmark, which can be ...
	func (b *B) trimOutput()

	// The results of a benchmark run. 
	type BenchmarkResult struct {
		N	int		// The number of iterations.
		T	time.Duration	// The total time taken.