remove duplicate duplicate words

src/librustc/mir/repr.rs

@@ -180,7 +180,7 @@ impl<'tcx> Mir<'tcx> {
         Some(Local::new(idx))
     }
 
-    /// Counts the number of locals, such that that local_index
+    /// Counts the number of locals, such that local_index
     /// will always return an index smaller than this count.
     pub fn count_locals(&self) -> usize {
         self.arg_decls.len() +

src/librustc/ty/mod.rs

@@ -2913,7 +2913,7 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
 
     /// See `ParameterEnvironment` struct def'n for details.
     /// If you were using `free_id: NodeId`, you might try `self.region_maps.item_extent(free_id)`
-    /// for the `free_id_outlive` parameter. (But note that that is not always quite right.)
+    /// for the `free_id_outlive` parameter. (But note that is not always quite right.)
     pub fn construct_parameter_environment(self,
                                            span: Span,
                                            def_id: DefId,

src/librustc_trans/collector.rs

@@ -153,7 +153,7 @@
 //! The collection algorithm handles this more or less transparently. If it is
 //! about to create a translation item for something with an external `DefId`,
 //! it will take a look if the MIR for that item is available, and if so just
-//! proceed normally. If the MIR is not available, it assumes that that item is
+//! proceed normally. If the MIR is not available, it assumes that the item is
 //! just linked to and no node is created; which is exactly what we want, since
 //! no machine code should be generated in the current crate for such an item.
 //!