This week there was a discussion on the golang-nuts mailing list about an idiomatic way to update a slice of structs. For example, consider this struct representing a set of counters. type E struct { A, B, C, D int}var e = make([]E, 1000)Updating these counters may take the form for i := range e { e[i].A += 1 e[i].B += 2 e[i].C += 3 e[i].D += 4}Which is good idiomatic Go code. It's pretty fast too BenchmarkManual 500000 4642 ns/opHowever there is a problem with this example. Each access the ith element of e requires the compiler to insert an...