Make it illegal to use modes in a fn signature with providing

an explicit variable name. (Step one to changing the defaults)

First step to #3535

4 files changed, 4 insertions, 4 deletions

diff --git a/src/libstd/arc.rs b/src/libstd/arc.rs
index c5b1aafc020..4ffe7245113 100644
--- a/src/libstd/arc.rs
+++ b/src/libstd/arc.rs
@@ -340,7 +340,7 @@ impl<T: Const Send> &RWARC<T> {
      * }
      * ~~~
      */
-    fn write_downgrade<U>(blk: fn(+RWWriteMode<T>) -> U) -> U {
+    fn write_downgrade<U>(blk: fn(+v: RWWriteMode<T>) -> U) -> U {
         let state = unsafe { get_shared_mutable_state(&self.x) };
         do borrow_rwlock(state).write_downgrade |write_mode| {
             check_poison(false, state.failed);
diff --git a/src/libstd/bitv.rs b/src/libstd/bitv.rs
index 21864ec0e7f..2c0a3716411 100644
--- a/src/libstd/bitv.rs
+++ b/src/libstd/bitv.rs
@@ -140,7 +140,7 @@ impl BigBitv {
     }
 
     #[inline(always)]
-     fn each_storage(op: fn(&uint) -> bool) {
+     fn each_storage(op: fn(&v: uint) -> bool) {
         for uint::range(0, self.storage.len()) |i| {
             let mut w = self.storage[i];
             let b = !op(w);
diff --git a/src/libstd/map.rs b/src/libstd/map.rs
index f28d7694b20..adaab0050bb 100644
--- a/src/libstd/map.rs
+++ b/src/libstd/map.rs
@@ -33,7 +33,7 @@ trait Map<K:Eq IterBytes Hash Copy, V: Copy> {
      *
      * Returns true if the key did not already exist in the map
      */
-    fn insert(+K, +V) -> bool;
+    fn insert(+v: K, +v: V) -> bool;
 
     /// Returns true if the map contains a value for the specified key
     fn contains_key(+key: K) -> bool;
diff --git a/src/libstd/sync.rs b/src/libstd/sync.rs
index 0fd80d4acf4..8fdcc22b4c1 100644
--- a/src/libstd/sync.rs
+++ b/src/libstd/sync.rs
@@ -539,7 +539,7 @@ impl &RWlock {
      * }
      * ~~~
      */
-    fn write_downgrade<U>(blk: fn(+RWlockWriteMode) -> U) -> U {
+    fn write_downgrade<U>(blk: fn(+v: RWlockWriteMode) -> U) -> U {
         // Implementation slightly different from the slicker 'write's above.
         // The exit path is conditional on whether the caller downgrades.
         let mut _release = None;