func getFiles(goroutines []*Goroutine) []string {
	files := map[string]struct{}{}
	for _, g := range goroutines {
		for _, c := range g.Stack.Calls {
			files[c.SrcPath] = struct{}{}
		}
	}
	out := make([]string, 0, len(files))
	for f := range files {
		out = append(out, f)
	}
	sort.Strings(out)
	return out
}
func getFiles(goroutines []*Goroutine) []string {
	files := map[string]struct{}{}
	for _, g := range goroutines {
		for _, c := range g.Stack.Calls {
			files[c.SrcPath] = struct{}{}
		}
	}
	out := make([]string, 0, len(files))
	for f := range files {
		out = append(out, f)
	}
	sort.Strings(out)
	return out
}
// getFiles returns all the source files deduped and ordered.