1 files changed, 11 insertions, 0 deletions
diff --git a/vendor/regex/src/re_set.rs b/vendor/regex/src/re_set.rs
index a6d886d76..7c8253f0c 100644
--- a/vendor/regex/src/re_set.rs
+++ b/vendor/regex/src/re_set.rs
@@ -289,6 +289,12 @@ impl RegexSet {
     }
 }
 
+impl Default for RegexSet {
+    fn default() -> Self {
+        RegexSet::empty()
+    }
+}
+
 /// A set of matches returned by a regex set.
 #[derive(Clone, Debug)]
 pub struct SetMatches {
@@ -315,6 +321,11 @@ impl SetMatches {
     }
 
     /// The total number of regexes in the set that created these matches.
+    ///
+    /// **WARNING:** This always returns the same value as [`RegexSet::len`].
+    /// In particular, it does *not* return the number of elements yielded by
+    /// [`SetMatches::iter`]. The only way to determine the total number of
+    /// matched regexes is to iterate over them.
     pub fn len(&self) -> usize {
         self.matches.len()
     }