cmd/gofmt: gofmt -r doesn't handle variadic values very well #5059
Description
When formatting function calls that provide variadic arguments using `slice...`, gofmt
drops "...":
% cat sample.go
package main
func doSomething(args ...string) {
}
func main() {
values := []string{"a", "b"}
doSomething(values...)
}
% gofmt -r 'doSomething(a) -> DoSomething(a)' sample.go
package main
func doSomething(args ...string) {
}
func main() {
values := []string{"a", "b"}
DoSomething(values)
}
It rewrote doSomething(values...) to DoSomething(values), meaning that the code does not
compile anymore.