if name == "_" {
					continue
				}
				if name != prefix {
					name = strings.TrimPrefix(n.Name, prefix)
				}
				name = upper(name)
				if names[name] {
					// Field name conflict: don't remove prefix.
					prefix = ""
					break fldLoop
				}
				names[name] = true
			}
		}
	}

	npad := 0
	for _, f := range fld {
		for _, n := range f.Names {