Be more specific about zero vs. two or more ASGs matching the name.

This also lets me remove the clever-but-silly Single trait.

1 files changed, 0 insertions, 24 deletions

diff --git a/src/single.rs b/src/single.rs
deleted file mode 100644
index b3f0b18..0000000
--- a/src/single.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-pub trait Single {
-    type Item;
-
-    fn single(self) -> Option<Self::Item>;
-}
-
-impl<T, I> Single for I
-where
-    I: IntoIterator<Item = T>,
-{
-    type Item = T;
-
-    fn single(self) -> Option<Self::Item> {
-        let mut iter = self.into_iter();
-
-        // There are three cases of interest:
-        //
-        // 1. `self` has zero items -> return None.
-        // 2. `self` has two or more items -> return None.
-        // 3. `self` has exactly one item -> return `iter.next()` unchanged, as
-        //    it holds that item.
-        iter.next().filter(|_| iter.next().is_none())
-    }
-}