remove unused mut qualifiers

src/libcollections/binary_heap.rs

@@ -673,7 +673,7 @@ impl<'a, T> IntoIterator for &'a BinaryHeap<T> where T: Ord {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Ord> Extend<T> for BinaryHeap<T> {
-    fn extend<Iter: Iterator<Item=T>>(&mut self, mut iter: Iter) {
+    fn extend<Iter: Iterator<Item=T>>(&mut self, iter: Iter) {
         let (lower, _) = iter.size_hint();
 
         self.reserve(lower);

src/libcollections/bit.rs

@@ -934,7 +934,7 @@ impl FromIterator<bool> for Bitv {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Extend<bool> for Bitv {
     #[inline]
-    fn extend<I: Iterator<Item=bool>>(&mut self, mut iterator: I) {
+    fn extend<I: Iterator<Item=bool>>(&mut self, iterator: I) {
         let (min, _) = iterator.size_hint();
         self.reserve(min);
         for element in iterator {
@@ -1141,7 +1141,7 @@ impl FromIterator<uint> for BitvSet {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Extend<uint> for BitvSet {
     #[inline]
-    fn extend<I: Iterator<Item=uint>>(&mut self, mut iterator: I) {
+    fn extend<I: Iterator<Item=uint>>(&mut self, iterator: I) {
         for i in iterator {
             self.insert(i);
         }
@@ -1353,7 +1353,7 @@ impl BitvSet {
         }
 
         // virtually pad other with 0's for equal lengths
-        let mut other_words = {
+        let other_words = {
             let (_, result) = match_words(self_bitv, other_bitv);
             result
         };

src/libcollections/btree/map.rs

@@ -846,7 +846,7 @@ impl<K: Ord, V> FromIterator<(K, V)> for BTreeMap<K, V> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<K: Ord, V> Extend<(K, V)> for BTreeMap<K, V> {
     #[inline]
-    fn extend<T: Iterator<Item=(K, V)>>(&mut self, mut iter: T) {
+    fn extend<T: Iterator<Item=(K, V)>>(&mut self, iter: T) {
         for (k, v) in iter {
             self.insert(k, v);
         }

src/libcollections/btree/set.rs

@@ -499,7 +499,7 @@ impl<'a, T> IntoIterator for &'a BTreeSet<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Ord> Extend<T> for BTreeSet<T> {
     #[inline]
-    fn extend<Iter: Iterator<Item=T>>(&mut self, mut iter: Iter) {
+    fn extend<Iter: Iterator<Item=T>>(&mut self, iter: Iter) {
         for elem in iter {
             self.insert(elem);
         }

src/libcollections/dlist.rs

@@ -856,7 +856,7 @@ impl<'a, T> IntoIterator for &'a mut DList<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<A> Extend<A> for DList<A> {
-    fn extend<T: Iterator<Item=A>>(&mut self, mut iterator: T) {
+    fn extend<T: Iterator<Item=A>>(&mut self, iterator: T) {
         for elt in iterator { self.push_back(elt); }
     }
 }

src/libcollections/enum_set.rs

@@ -266,7 +266,7 @@ impl<'a, E> IntoIterator for &'a EnumSet<E> where E: CLike {
 }
 
 impl<E:CLike> Extend<E> for EnumSet<E> {
-    fn extend<I: Iterator<Item=E>>(&mut self, mut iterator: I) {
+    fn extend<I: Iterator<Item=E>>(&mut self, iterator: I) {
         for element in iterator {
             self.insert(element);
         }

src/libcollections/lib.rs

@@ -22,8 +22,6 @@
        html_root_url = "http://doc.rust-lang.org/nightly/",
        html_playground_url = "http://play.rust-lang.org/")]
 
-#![cfg_attr(not(stage0), allow(unused_mut))] // NOTE: remove after stage0 snap
-
 #![feature(alloc)]
 #![feature(box_syntax)]
 #![feature(core)]

src/libcollections/ring_buf.rs

@@ -1635,7 +1635,7 @@ impl<'a, T> IntoIterator for &'a mut RingBuf<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<A> Extend<A> for RingBuf<A> {
-    fn extend<T: Iterator<Item=A>>(&mut self, mut iterator: T) {
+    fn extend<T: Iterator<Item=A>>(&mut self, iterator: T) {
         for elt in iterator {
             self.push_back(elt);
         }

src/libcollections/string.rs

@@ -729,7 +729,7 @@ impl<'a> FromIterator<&'a str> for String {
 #[unstable(feature = "collections",
            reason = "waiting on Extend stabilization")]
 impl Extend<char> for String {
-    fn extend<I:Iterator<Item=char>>(&mut self, mut iterator: I) {
+    fn extend<I:Iterator<Item=char>>(&mut self, iterator: I) {
         let (lower_bound, _) = iterator.size_hint();
         self.reserve(lower_bound);
         for ch in iterator {
@@ -741,7 +741,7 @@ impl Extend<char> for String {
 #[unstable(feature = "collections",
            reason = "waiting on Extend stabilization")]
 impl<'a> Extend<&'a str> for String {
-    fn extend<I: Iterator<Item=&'a str>>(&mut self, mut iterator: I) {
+    fn extend<I: Iterator<Item=&'a str>>(&mut self, iterator: I) {
         // A guess that at least one byte per iterator element will be needed.
         let (lower_bound, _) = iterator.size_hint();
         self.reserve(lower_bound);

src/libcollections/vec.rs

@@ -1375,7 +1375,7 @@ impl<T> ops::DerefMut for Vec<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T> FromIterator<T> for Vec<T> {
     #[inline]
-    fn from_iter<I:Iterator<Item=T>>(mut iterator: I) -> Vec<T> {
+    fn from_iter<I:Iterator<Item=T>>(iterator: I) -> Vec<T> {
         let (lower, _) = iterator.size_hint();
         let mut vector = Vec::with_capacity(lower);
         for element in iterator {
@@ -1412,7 +1412,7 @@ impl<'a, T> IntoIterator for &'a mut Vec<T> {
 #[unstable(feature = "collections", reason = "waiting on Extend stability")]
 impl<T> Extend<T> for Vec<T> {
     #[inline]
-    fn extend<I: Iterator<Item=T>>(&mut self, mut iterator: I) {
+    fn extend<I: Iterator<Item=T>>(&mut self, iterator: I) {
         let (lower, _) = iterator.size_hint();
         self.reserve(lower);
         for element in iterator {

src/libcollections/vec_map.rs

@@ -562,7 +562,7 @@ impl<'a, T> IntoIterator for &'a mut VecMap<T> {
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<V> Extend<(uint, V)> for VecMap<V> {
-    fn extend<Iter: Iterator<Item=(uint, V)>>(&mut self, mut iter: Iter) {
+    fn extend<Iter: Iterator<Item=(uint, V)>>(&mut self, iter: Iter) {
         for (k, v) in iter {
             self.insert(k, v);
         }

src/libcore/iter.rs

@@ -174,7 +174,7 @@ pub trait IteratorExt: Iterator + Sized {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn last(mut self) -> Option<Self::Item> {
+    fn last(self) -> Option<Self::Item> {
         let mut last = None;
         for x in self { last = Some(x); }
         last
@@ -588,7 +588,7 @@ pub trait IteratorExt: Iterator + Sized {
     /// ```
     #[unstable(feature = "core",
                reason = "recently added as part of collections reform")]
-    fn partition<B, F>(mut self, mut f: F) -> (B, B) where
+    fn partition<B, F>(self, mut f: F) -> (B, B) where
         B: Default + Extend<Self::Item>,
         F: FnMut(&Self::Item) -> bool
     {
@@ -617,7 +617,7 @@ pub trait IteratorExt: Iterator + Sized {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fold<B, F>(mut self, init: B, mut f: F) -> B where
+    fn fold<B, F>(self, init: B, mut f: F) -> B where
         F: FnMut(B, Self::Item) -> B,
     {
         let mut accum = init;
@@ -638,7 +638,7 @@ pub trait IteratorExt: Iterator + Sized {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn all<F>(mut self, mut f: F) -> bool where F: FnMut(Self::Item) -> bool {
+    fn all<F>(self, mut f: F) -> bool where F: FnMut(Self::Item) -> bool {
         for x in self { if !f(x) { return false; } }
         true
     }
@@ -946,7 +946,7 @@ pub trait IteratorExt: Iterator + Sized {
     /// assert_eq!([2, 4], right);
     /// ```
     #[unstable(feature = "core", reason = "recent addition")]
-    fn unzip<A, B, FromA, FromB>(mut self) -> (FromA, FromB) where
+    fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB) where
         FromA: Default + Extend<A>,
         FromB: Default + Extend<B>,
         Self: Iterator<Item=(A, B)>,

src/libcore/lib.rs

@@ -59,7 +59,6 @@
 #![no_std]
 #![allow(raw_pointer_derive)]
 #![deny(missing_docs)]
-#![cfg_attr(not(stage0), allow(unused_mut))] // NOTE: remove after stage0 snap
 
 #![feature(int_uint)]
 #![feature(intrinsics, lang_items)]

src/libcore/result.rs

@@ -956,7 +956,7 @@ pub fn fold<T,
             E,
             F: FnMut(V, T) -> V,
             Iter: Iterator<Item=Result<T, E>>>(
-            mut iterator: Iter,
+            iterator: Iter,
             mut init: V,
             mut f: F)
             -> Result<V, E> {

src/librustc/lib.rs

@@ -23,8 +23,6 @@
       html_favicon_url = "http://www.rust-lang.org/favicon.ico",
       html_root_url = "http://doc.rust-lang.org/nightly/")]
 
-#![cfg_attr(not(stage0), allow(unused_mut))] // NOTE: remove after stage0 snap
-
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(core)]

src/librustc/metadata/loader.rs

@@ -610,7 +610,7 @@ impl<'a> Context<'a> {
         let mut rlibs = HashMap::new();
         let mut dylibs = HashMap::new();
         {
-            let mut locs = locs.iter().map(|l| Path::new(&l[])).filter(|loc| {
+            let locs = locs.iter().map(|l| Path::new(&l[])).filter(|loc| {
                 if !loc.exists() {
                     sess.err(&format!("extern location for {} does not exist: {}",
                                      self.crate_name, loc.display())[]);

src/librustc/middle/subst.rs

@@ -317,7 +317,7 @@ impl<T> VecPerParamSpace<T> {
     ///
     /// Unlike the `extend` method in `Vec`, this should not be assumed
     /// to be a cheap operation (even when amortized over many calls).
-    pub fn extend<I:Iterator<Item=T>>(&mut self, space: ParamSpace, mut values: I) {
+    pub fn extend<I:Iterator<Item=T>>(&mut self, space: ParamSpace, values: I) {
         // This could be made more efficient, obviously.
         for item in values {
             self.push(space, item);

src/librustc/middle/traits/select.rs

@@ -295,7 +295,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
 
     fn evaluate_predicates_recursively<'a,'o,I>(&mut self,
                                                 stack: Option<&TraitObligationStack<'o, 'tcx>>,
-                                                mut predicates: I)
+                                                predicates: I)
                                                 -> EvaluationResult<'tcx>
         where I : Iterator<Item=&'a PredicateObligation<'tcx>>, 'tcx:'a
     {

src/librustc_trans/back/link.rs

@@ -265,7 +265,7 @@ pub fn sanitize(s: &str) -> String {
     return result;
 }
 
-pub fn mangle<PI: Iterator<Item=PathElem>>(mut path: PI,
+pub fn mangle<PI: Iterator<Item=PathElem>>(path: PI,
                                       hash: Option<&str>) -> String {
     // Follow C++ namespace-mangling style, see
     // http://en.wikipedia.org/wiki/Name_mangling for more info.
@@ -1055,10 +1055,10 @@ fn add_local_native_libraries(cmd: &mut Command, sess: &Session) {
     let libs = sess.cstore.get_used_libraries();
     let libs = libs.borrow();
 
-    let mut staticlibs = libs.iter().filter_map(|&(ref l, kind)| {
+    let staticlibs = libs.iter().filter_map(|&(ref l, kind)| {
         if kind == cstore::NativeStatic {Some(l)} else {None}
     });
-    let mut others = libs.iter().filter(|&&(_, kind)| {
+    let others = libs.iter().filter(|&&(_, kind)| {
         kind != cstore::NativeStatic
     });
 

src/librustc_trans/lib.rs

@@ -23,8 +23,6 @@
       html_favicon_url = "http://www.rust-lang.org/favicon.ico",
       html_root_url = "http://doc.rust-lang.org/nightly/")]
 
-#![cfg_attr(not(stage0), allow(unused_mut))] // NOTE: remove after stage0 snap
-
 #![feature(alloc)]
 #![feature(box_syntax)]
 #![feature(collections)]

src/librustc_trans/trans/debuginfo.rs

@@ -3848,7 +3848,7 @@ fn push_debuginfo_type_name<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
                       def_id: ast::DefId,
                       qualified: bool,
                       output: &mut String) {
-        ty::with_path(cx.tcx(), def_id, |mut path| {
+        ty::with_path(cx.tcx(), def_id, |path| {
             if qualified {
                 if def_id.krate == ast::LOCAL_CRATE {
                     output.push_str(crate_root_namespace(cx));

src/librustc_typeck/check/coercion.rs

@@ -353,7 +353,7 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
                     assert!(ty_substs_a.len() == ty_substs_b.len());
 
                     let mut result = None;
-                    let mut tps = ty_substs_a.iter().zip(ty_substs_b.iter()).enumerate();
+                    let tps = ty_substs_a.iter().zip(ty_substs_b.iter()).enumerate();
                     for (i, (tp_a, tp_b)) in tps {
                         if self.fcx.infcx().try(|_| self.subtype(*tp_a, *tp_b)).is_ok() {
                             continue;

src/librustc_typeck/check/mod.rs

@@ -805,7 +805,7 @@ fn check_trait_on_unimplemented<'a, 'tcx>(ccx: &CrateCtxt<'a, 'tcx>,
         a.check_name("rustc_on_unimplemented")
     }) {
         if let Some(ref istring) = attr.value_str() {
-            let mut parser = Parser::new(istring.get());
+            let parser = Parser::new(istring.get());
             let types = generics.ty_params.as_slice();
             for token in parser {
                 match token {

src/librustc_typeck/check/regionck.rs

@@ -854,7 +854,7 @@ fn constrain_callee(rcx: &mut Rcx,
 fn constrain_call<'a, I: Iterator<Item=&'a ast::Expr>>(rcx: &mut Rcx,
                                                        call_expr: &ast::Expr,
                                                        receiver: Option<&ast::Expr>,
-                                                       mut arg_exprs: I,
+                                                       arg_exprs: I,
                                                        implicitly_ref_args: bool) {
     //! Invoked on every call site (i.e., normal calls, method calls,
     //! and overloaded operators). Constrains the regions which appear

src/librustc_typeck/collect.rs

@@ -439,7 +439,7 @@ fn convert_associated_type<'a, 'tcx>(ccx: &CollectCtxt<'a, 'tcx>,
 
 fn convert_methods<'a,'tcx,'i,I>(ccx: &CollectCtxt<'a, 'tcx>,
                                  container: ImplOrTraitItemContainer,
-                                 mut ms: I,
+                                 ms: I,
                                  untransformed_rcvr_ty: Ty<'tcx>,
                                  rcvr_ty_generics: &ty::Generics<'tcx>,
                                  rcvr_visibility: ast::Visibility)
@@ -1655,7 +1655,7 @@ fn enforce_impl_ty_params_are_constrained<'tcx>(tcx: &ty::ctxt<'tcx>,
     loop {
         let num_inputs = input_parameters.len();
 
-        let mut projection_predicates =
+        let projection_predicates =
             impl_scheme.generics.predicates
             .iter()
             .filter_map(|predicate| {

src/librustc_typeck/lib.rs

@@ -73,7 +73,6 @@ This API is completely unstable and subject to change.
       html_root_url = "http://doc.rust-lang.org/nightly/")]
 
 #![allow(non_camel_case_types)]
-#![cfg_attr(not(stage0), allow(unused_mut))] // NOTE: remove after stage0 snap
 
 #![feature(box_syntax)]
 #![feature(collections)]

src/libstd/collections/hash/map.rs

@@ -1416,7 +1416,7 @@ impl<K, V, S, H> IntoIterator for HashMap<K, V, S>
 {
     type Iter = IntoIter<K, V>;
 
-    fn into_iter(mut self) -> IntoIter<K, V> {
+    fn into_iter(self) -> IntoIter<K, V> {
         self.into_iter()
     }
 }
@@ -1575,7 +1575,7 @@ impl<K, V, S, H> Extend<(K, V)> for HashMap<K, V, S>
           S: HashState<Hasher=H>,
           H: hash::Hasher<Output=u64>
 {
-    fn extend<T: Iterator<Item=(K, V)>>(&mut self, mut iter: T) {
+    fn extend<T: Iterator<Item=(K, V)>>(&mut self, iter: T) {
         for (k, v) in iter {
             self.insert(k, v);
         }

src/libstd/collections/hash/set.rs

@@ -636,7 +636,7 @@ impl<T, S, H> Extend<T> for HashSet<T, S>
           S: HashState<Hasher=H>,
           H: hash::Hasher<Output=u64>
 {
-    fn extend<I: Iterator<Item=T>>(&mut self, mut iter: I) {
+    fn extend<I: Iterator<Item=T>>(&mut self, iter: I) {
         for k in iter {
             self.insert(k);
         }

src/libstd/lib.rs

@@ -127,7 +127,6 @@
 #![no_std]
 
 #![deny(missing_docs)]
-#![cfg_attr(not(stage0), allow(unused_mut))] // NOTE: remove after stage0 snap
 
 #[cfg(test)]
 #[macro_use]

src/libstd/old_io/fs.rs

@@ -597,7 +597,7 @@ pub fn mkdir_recursive(path: &Path, mode: FilePermission) -> IoResult<()> {
         return Ok(())
     }
 
-    let mut comps = path.components();
+    let comps = path.components();
     let mut curpath = path.root_path().unwrap_or(Path::new("."));
 
     for c in comps {

src/libstd/sys/common/wtf8.rs

@@ -366,7 +366,7 @@ impl FromIterator<CodePoint> for Wtf8Buf {
 /// This replaces surrogate code point pairs with supplementary code points,
 /// like concatenating ill-formed UTF-16 strings effectively would.
 impl Extend<CodePoint> for Wtf8Buf {
-    fn extend<T: Iterator<Item=CodePoint>>(&mut self, mut iterator: T) {
+    fn extend<T: Iterator<Item=CodePoint>>(&mut self, iterator: T) {
         let (low, _high) = iterator.size_hint();
         // Lower bound of one byte per code point (ASCII only)
         self.bytes.reserve(low);

src/libsyntax/attr.rs

@@ -373,7 +373,7 @@ impl fmt::Display for StabilityLevel {
 fn find_stability_generic<'a,
                               AM: AttrMetaMethods,
                               I: Iterator<Item=&'a AM>>
-                             (diagnostic: &SpanHandler, mut attrs: I, item_sp: Span)
+                             (diagnostic: &SpanHandler, attrs: I, item_sp: Span)
                              -> (Option<Stability>, Vec<&'a AM>) {
 
     let mut stab: Option<Stability> = None;

src/libsyntax/lib.rs

@@ -23,8 +23,6 @@
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/nightly/")]
 
-#![cfg_attr(not(stage0), allow(unused_mut))] // NOTE: remove after stage0 snap
-
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(core)]

src/libsyntax/util/small_vector.rs

@@ -38,7 +38,7 @@ impl<T> FromIterator<T> for SmallVector<T> {
 }
 
 impl<T> Extend<T> for SmallVector<T> {
-    fn extend<I: Iterator<Item=T>>(&mut self, mut iter: I) {
+    fn extend<I: Iterator<Item=T>>(&mut self, iter: I) {
         for val in iter {
             self.push(val);
         }

src/libtest/lib.rs

@@ -32,8 +32,6 @@
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/nightly/")]
 
-#![cfg_attr(not(stage0), allow(unused_mut))] // NOTE: remove after stage0 snap
-
 #![feature(asm, slicing_syntax)]
 #![feature(box_syntax)]
 #![feature(collections)]

src/libtest/stats.rs

@@ -332,7 +332,7 @@ pub fn winsorize<T: Float + FromPrimitive>(samples: &mut [T], pct: T) {
 
 /// Returns a HashMap with the number of occurrences of every element in the
 /// sequence that the iterator exposes.
-pub fn freq_count<T, U>(mut iter: T) -> hash_map::HashMap<U, uint>
+pub fn freq_count<T, U>(iter: T) -> hash_map::HashMap<U, uint>
   where T: Iterator<Item=U>, U: Eq + Clone + Hash<Hasher>
 {
     let mut map: hash_map::HashMap<U,uint> = hash_map::HashMap::new();