Deprecation warnings when compiling tests of libregex

[dgiagio]

There are some deprecation warnings when compiling tests of libregex.

test/bench.rs:25:38: 25:47 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:25                                 "a?".repeat(n),
                                                      ^~~~~~~~~
test/bench.rs:26:37: 26:46 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:26                                 "a".repeat(n)).as_slice()).unwrap();
                                                     ^~~~~~~~~
test/bench.rs:27:20: 27:29 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:27     let text = "a".repeat(n);
                                    ^~~~~~~~~
test/bench.rs:34:35: 34:45 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:34     let text = format!("{}y", "x".repeat(50));
                                                   ^~~~~~~~~~
test/bench.rs:41:35: 41:45 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:41     let text = format!("{}y", "x".repeat(50));
                                                   ^~~~~~~~~~
test/bench.rs:48:38: 48:48 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:48     let text = format!("{}w", "xxxx".repeat(20));
                                                      ^~~~~~~~~~
test/bench.rs:56:38: 56:48 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:56     let text = format!("{}c", "bbbb".repeat(20));
                                                      ^~~~~~~~~~
test/bench.rs:80:45: 80:55 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:80     let text = "abcdefghijklmnopqrstuvwxyz".repeat(15);
                                                             ^~~~~~~~~~
test/bench.rs:94:45: 94:55 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:94     let text = "abcdefghijklmnopqrstuvwxyz".repeat(15);
                                                             ^~~~~~~~~~
test/bench.rs:25:38: 25:47 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:25                                 "a?".repeat(n),
                                                      ^~~~~~~~~
test/bench.rs:26:37: 26:46 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:26                                 "a".repeat(n)).as_slice()).unwrap();
                                                     ^~~~~~~~~
test/bench.rs:27:20: 27:29 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:27     let text = "a".repeat(n);
                                    ^~~~~~~~~
test/bench.rs:34:35: 34:45 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:34     let text = format!("{}y", "x".repeat(50));
                                                   ^~~~~~~~~~
test/bench.rs:41:35: 41:45 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:41     let text = format!("{}y", "x".repeat(50));
                                                   ^~~~~~~~~~
test/bench.rs:48:38: 48:48 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:48     let text = format!("{}w", "xxxx".repeat(20));
                                                      ^~~~~~~~~~
test/bench.rs:56:38: 56:48 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:56     let text = format!("{}c", "bbbb".repeat(20));
                                                      ^~~~~~~~~~
test/bench.rs:80:45: 80:55 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:80     let text = "abcdefghijklmnopqrstuvwxyz".repeat(15);
                                                             ^~~~~~~~~~
test/bench.rs:94:45: 94:55 warning: use of deprecated item: use repeat(self).take(n).collect() instead, #[warn(deprecated)] on by default
test/bench.rs:94     let text = "abcdefghijklmnopqrstuvwxyz".repeat(15);
                                                             ^~~~~~~~~~