Improve size_hint lower bound for DecodeUtf16 iterator

rust-lang · Sep 8, 2021 · bea5cd1 · bea5cd1
1 parent 47ae8de
commit bea5cd1
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/library/core/src/char/decode.rs b/library/core/src/char/decode.rs
@@ -122,7 +122,7 @@ impl<I: Iterator<Item = u16>> Iterator for DecodeUtf16<I> {
         let (low, high) = self.iter.size_hint();
         // we could be entirely valid surrogates (2 elements per
         // char), or entirely non-surrogates (1 element per char)
-        (low / 2, high)
+        (low.div_ceil(2), high)
     }
 }