Sel: ast.NewIdent(typ.Sel.Name),
				X:   &ast.Ident{Name: id.Name, NamePos: pos},
			}
		}
	}
	return nil // shouldn't happen, but be conservative and don't panic
}

func (r *reader) filterSpecList(list []ast.Spec, tok token.Token) []ast.Spec {
	if tok == token.CONST {
		// Propagate any type information that would get lost otherwise
		// when unexported constants are filtered.
		var prevType ast.Expr

			// out.
			// If the type contains filtered elements,
			// keep the declaration.
			return filterType(s.Type, f, export)
		}
	}
	return false
}

func filterSpecList(list []Spec, f Filter, export bool) []Spec {
	j := 0
	for _, s := range list {
		if filterSpec(s, f, export) {
			list[j] = s
			j++
		}
	}
	return list[0:j]
}