Split mutable methods out of Set and Map

Fixes most of #4989. I didn't add Persistent{Set,Map} since the only
persistent data structure is fun_treemap and its functionality is
currently too limited to build a trait out of.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/task/spawn.rs b/src/libstd/task/spawn.rs
index f45d470a9f6..27cb1c2c100 100644
--- a/src/libstd/task/spawn.rs
+++ b/src/libstd/task/spawn.rs
@@ -77,7 +77,7 @@ use prelude::*;
 use cast::transmute;
 use cast;
 use cell::Cell;
-use container::Map;
+use container::MutableMap;
 use comm::{Chan, GenericChan};
 use hashmap::HashSet;
 use task::local_data_priv::{local_get, local_set, OldHandle};