Upgrade rust/crates/regex to 1.4.5

Test: make
Change-Id: I1d9343bd9712ddd57023af2c5d248993a2c31088
diff --git a/tests/test_default.rs b/tests/test_default.rs
index 241e580..af634a0 100644
--- a/tests/test_default.rs
+++ b/tests/test_default.rs
@@ -83,26 +83,49 @@
 #[test]
 fn oibits() {
     use regex::bytes;
-    use regex::{Regex, RegexBuilder};
-    use std::panic::UnwindSafe;
+    use regex::{Regex, RegexBuilder, RegexSet, RegexSetBuilder};
+    use std::panic::{RefUnwindSafe, UnwindSafe};
 
     fn assert_send<T: Send>() {}
     fn assert_sync<T: Sync>() {}
     fn assert_unwind_safe<T: UnwindSafe>() {}
+    fn assert_ref_unwind_safe<T: RefUnwindSafe>() {}
 
     assert_send::<Regex>();
     assert_sync::<Regex>();
     assert_unwind_safe::<Regex>();
+    assert_ref_unwind_safe::<Regex>();
     assert_send::<RegexBuilder>();
     assert_sync::<RegexBuilder>();
     assert_unwind_safe::<RegexBuilder>();
+    assert_ref_unwind_safe::<RegexBuilder>();
 
     assert_send::<bytes::Regex>();
     assert_sync::<bytes::Regex>();
     assert_unwind_safe::<bytes::Regex>();
+    assert_ref_unwind_safe::<bytes::Regex>();
     assert_send::<bytes::RegexBuilder>();
     assert_sync::<bytes::RegexBuilder>();
     assert_unwind_safe::<bytes::RegexBuilder>();
+    assert_ref_unwind_safe::<bytes::RegexBuilder>();
+
+    assert_send::<RegexSet>();
+    assert_sync::<RegexSet>();
+    assert_unwind_safe::<RegexSet>();
+    assert_ref_unwind_safe::<RegexSet>();
+    assert_send::<RegexSetBuilder>();
+    assert_sync::<RegexSetBuilder>();
+    assert_unwind_safe::<RegexSetBuilder>();
+    assert_ref_unwind_safe::<RegexSetBuilder>();
+
+    assert_send::<bytes::RegexSet>();
+    assert_sync::<bytes::RegexSet>();
+    assert_unwind_safe::<bytes::RegexSet>();
+    assert_ref_unwind_safe::<bytes::RegexSet>();
+    assert_send::<bytes::RegexSetBuilder>();
+    assert_sync::<bytes::RegexSetBuilder>();
+    assert_unwind_safe::<bytes::RegexSetBuilder>();
+    assert_ref_unwind_safe::<bytes::RegexSetBuilder>();
 }
 
 // See: https://github.com/rust-lang/regex/issues/568
@@ -113,3 +136,18 @@
 
     let _ = panic::catch_unwind(|| Regex::new("a").unwrap());
 }
+
+// See: https://github.com/rust-lang/regex/issues/750
+#[test]
+#[cfg(target_pointer_width = "64")]
+fn regex_is_reasonably_small() {
+    use std::mem::size_of;
+
+    use regex::bytes;
+    use regex::{Regex, RegexSet};
+
+    assert_eq!(16, size_of::<Regex>());
+    assert_eq!(16, size_of::<RegexSet>());
+    assert_eq!(16, size_of::<bytes::Regex>());
+    assert_eq!(16, size_of::<bytes::RegexSet>());
+}