Make util::str::str_join operate on Iterators

components/util/str.rs

@@ -326,8 +326,10 @@ pub unsafe fn c_str_to_string(s: *const c_char) -> String {
     from_utf8(CStr::from_ptr(s).to_bytes()).unwrap().to_owned()
 }
 
-pub fn str_join<T: AsRef<str>>(strs: &[T], join: &str) -> String {
-    strs.iter().fold(String::new(), |mut acc, s| {
+pub fn str_join<I, T>(strs: I, join: &str) -> String
+    where I: IntoIterator<Item=T>, T: AsRef<str>,
+{
+    strs.into_iter().fold(String::new(), |mut acc, s| {
         if !acc.is_empty() { acc.push_str(join); }
         acc.push_str(s.as_ref());
         acc