From 5958c92c639e54606bae15ab61ee0c49577a791e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mat=C4=9Bj=20Laitl?= <matej@laitl.cz>
Date: Wed, 20 Feb 2019 18:46:39 +0100
Subject: Convert into CalendarComponent in Calendar::extend()

Previously, one needed to pass IntoIterator<CalendarElement>, but
CalendarElement is in private module `calendar` (and not re-exported).

Now this also becomes symmetric with other addition methods that allow
Into<CalendarElement>.
---
 src/calendar.rs | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/calendar.rs b/src/calendar.rs
index d492345..377ba56 100644
--- a/src/calendar.rs
+++ b/src/calendar.rs
@@ -59,10 +59,11 @@ impl Calendar {
     }
 
     /// Extends this `Calendar` with the contends of another.
-    pub fn extend<T>(&mut self, other: T)
-        where T: IntoIterator<Item=CalendarElement>
+    pub fn extend<T, U>(&mut self, other: T)
+        where T: IntoIterator<Item=U>,
+        U: Into<CalendarElement>
     {
-        self.components.extend(other);
+        self.components.extend(other.into_iter().map(|x| x.into()));
     }
 
     /// Appends an element to the back of the `Calendar`.
@@ -126,4 +127,15 @@ mod tests {
         calendar.extend(components);
         assert_eq!(calendar.components.len(), 2);
     }
+
+    #[test]
+    fn calendar_extend_events() {
+        let mut calendar = Calendar::new();
+        let events = vec![
+            Event::new(),
+            Event::new(),
+        ];
+        calendar.extend(events);
+        assert_eq!(calendar.components.len(), 2);
+    }
 }
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