std: Deprecate result::fold

This function has seen very little use and it seems better to explore this
functionality through iterator adaptors instead of specialized functions.

diff --git a/src/libcore/result.rs b/src/libcore/result.rs
index 7fd845edc3f84c4bc4645e850d03731fa188e3bd..d87c1020dcc2f99e58e9ec0d4de3649e2a7744bf 100644 (file)
--- a/src/libcore/result.rs
+++ b/src/libcore/result.rs
@@ -968,6 +968,9 @@ fn next(&mut self) -> Option<T> {
 #[inline]
 #[unstable(feature = "result_fold",
            reason = "unclear if this function should exist")]
+#[deprecated(since = "1.2.0",
+             reason = "has not seen enough usage to justify its position in \
+                       the standard library")]
 pub fn fold<T,
             V,
             E,