String: add a FIXME to from_utf16

rust-lang · Nov 21, 2018 · 591607d · 591607d
1 parent 464c9da
commit 591607d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
@@ -618,6 +618,8 @@ impl String {
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn from_utf16(v: &[u16]) -> Result<String, FromUtf16Error> {
+        // This isn't done via collect::<Result<_, _>>() for performance reasons.
+        // FIXME: the function can be simplified again when #48994 is closed.
         let mut ret = String::with_capacity(v.len());
         for c in decode_utf16(v.iter().cloned()) {
             if let Ok(c) = c {