diff --git a/src/libcore/fmt/mod.rs b/src/libcore/fmt/mod.rs
index eb086c201812a..6c48c29ecd151 100644
--- a/src/libcore/fmt/mod.rs
+++ b/src/libcore/fmt/mod.rs
@@ -434,7 +434,7 @@ impl<'a> Display for Arguments<'a> {
 pub trait Debug {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// Format trait for an empty format, `{}`.
@@ -477,7 +477,7 @@ pub trait Debug {
 pub trait Display {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// Format trait for the `o` character.
@@ -524,7 +524,7 @@ pub trait Display {
 pub trait Octal {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// Format trait for the `b` character.
@@ -571,7 +571,7 @@ pub trait Octal {
 pub trait Binary {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// Format trait for the `x` character.
@@ -619,7 +619,7 @@ pub trait Binary {
 pub trait LowerHex {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// Format trait for the `X` character.
@@ -667,7 +667,7 @@ pub trait LowerHex {
 pub trait UpperHex {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// Format trait for the `p` character.
@@ -712,7 +712,7 @@ pub trait UpperHex {
 pub trait Pointer {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// Format trait for the `e` character.
@@ -755,7 +755,7 @@ pub trait Pointer {
 pub trait LowerExp {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// Format trait for the `E` character.
@@ -798,7 +798,7 @@ pub trait LowerExp {
 pub trait UpperExp {
     /// Formats the value using the given formatter.
     #[stable(feature = "rust1", since = "1.0.0")]
-    fn fmt(&self, &mut Formatter) -> Result;
+    fn fmt(&self, f: &mut Formatter) -> Result;
 }
 
 /// The `write` function takes an output stream, a precompiled format string,
diff --git a/src/libcore/ops.rs b/src/libcore/ops.rs
index 566fb89365a51..59bcb340ec99a 100644
--- a/src/libcore/ops.rs
+++ b/src/libcore/ops.rs
@@ -1324,7 +1324,7 @@ shr_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
 pub trait AddAssign<Rhs=Self> {
     /// The method for the `+=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn add_assign(&mut self, Rhs);
+    fn add_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! add_assign_impl {
@@ -1380,7 +1380,7 @@ add_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 pub trait SubAssign<Rhs=Self> {
     /// The method for the `-=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn sub_assign(&mut self, Rhs);
+    fn sub_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! sub_assign_impl {
@@ -1425,7 +1425,7 @@ sub_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 pub trait MulAssign<Rhs=Self> {
     /// The method for the `*=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn mul_assign(&mut self, Rhs);
+    fn mul_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! mul_assign_impl {
@@ -1470,7 +1470,7 @@ mul_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 pub trait DivAssign<Rhs=Self> {
     /// The method for the `/=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn div_assign(&mut self, Rhs);
+    fn div_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! div_assign_impl {
@@ -1514,7 +1514,7 @@ div_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 pub trait RemAssign<Rhs=Self> {
     /// The method for the `%=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn rem_assign(&mut self, Rhs);
+    fn rem_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! rem_assign_impl {
@@ -1600,7 +1600,7 @@ rem_assign_impl! { usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 f32 f64 }
 pub trait BitAndAssign<Rhs=Self> {
     /// The method for the `&=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn bitand_assign(&mut self, Rhs);
+    fn bitand_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! bitand_assign_impl {
@@ -1644,7 +1644,7 @@ bitand_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
 pub trait BitOrAssign<Rhs=Self> {
     /// The method for the `|=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn bitor_assign(&mut self, Rhs);
+    fn bitor_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! bitor_assign_impl {
@@ -1688,7 +1688,7 @@ bitor_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
 pub trait BitXorAssign<Rhs=Self> {
     /// The method for the `^=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn bitxor_assign(&mut self, Rhs);
+    fn bitxor_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! bitxor_assign_impl {
@@ -1732,7 +1732,7 @@ bitxor_assign_impl! { bool usize u8 u16 u32 u64 u128 isize i8 i16 i32 i64 i128 }
 pub trait ShlAssign<Rhs> {
     /// The method for the `<<=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn shl_assign(&mut self, Rhs);
+    fn shl_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! shl_assign_impl {
@@ -1797,7 +1797,7 @@ shl_assign_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
 pub trait ShrAssign<Rhs=Self> {
     /// The method for the `>>=` operator
     #[stable(feature = "op_assign_traits", since = "1.8.0")]
-    fn shr_assign(&mut self, Rhs);
+    fn shr_assign(&mut self, rhs: Rhs);
 }
 
 macro_rules! shr_assign_impl {
diff --git a/src/libcore/str/pattern.rs b/src/libcore/str/pattern.rs
index 7dced2ba7514c..8493afe98bc57 100644
--- a/src/libcore/str/pattern.rs
+++ b/src/libcore/str/pattern.rs
@@ -240,7 +240,7 @@ pub trait DoubleEndedSearcher<'a>: ReverseSearcher<'a> {}
 
 #[doc(hidden)]
 trait CharEq {
-    fn matches(&mut self, char) -> bool;
+    fn matches(&mut self, c: char) -> bool;
     fn only_ascii(&self) -> bool;
 }
 
@@ -1178,8 +1178,8 @@ impl TwoWaySearcher {
 trait TwoWayStrategy {
     type Output;
     fn use_early_reject() -> bool;
-    fn rejecting(usize, usize) -> Self::Output;
-    fn matching(usize, usize) -> Self::Output;
+    fn rejecting(a: usize, b: usize) -> Self::Output;
+    fn matching(a: usize, b: usize) -> Self::Output;
 }
 
 /// Skip to match intervals as quickly as possible