gistfile1.txt

/Users/alex/code/rust2/src/libcore/task/spawn.rs:105:26: 105:45 error: multiple applicable methods in scope
/Users/alex/code/rust2/src/libcore/task/spawn.rs:105     let didnt_overwrite = tasks.insert(task);
                                                                               ^~~~~~~~~~~~~~~~~~~
/Users/alex/code/rust2/src/libcore/container.rs:74:4: 76:5 note: candidate #1 is `container::__extensions__::insert`
/Users/alex/code/rust2/src/libcore/container.rs:74     fn insert(&mut self, key: K, value: V) -> bool {
/Users/alex/code/rust2/src/libcore/container.rs:75         self.swap(key, value).is_none()
/Users/alex/code/rust2/src/libcore/container.rs:76     }
/Users/alex/code/rust2/src/libcore/hashmap.rs:562:4: 562:73 note: candidate #2 is `hashmap::__extensions__::insert`
/Users/alex/code/rust2/src/libcore/hashmap.rs:562     fn insert(&mut self, value: T) -> bool { self.map.insert(value, ()) }
                                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

gistfile2.rs

 type TaskSet = HashSet<*rust_task>;                                         
                                                                             
 fn taskset_insert(tasks: &mut TaskSet, task: *rust_task) {                  
     let didnt_overwrite = tasks.insert(task);                               
     assert!(didnt_overwrite);                                               
 }