fix some anon params

Author: mark-i-m

src/librustc/lint/mod.rs

@@ -266,7 +266,7 @@ macro_rules! late_lint_methods {
 
 macro_rules! expand_lint_pass_methods {
     ($context:ty, [$($(#[$attr:meta])* fn $name:ident($($param:ident: $arg:ty),*);)*]) => (
-        $(#[inline(always)] fn $name(&mut self, $context, $(_: $arg),*) {})*
+        $(#[inline(always)] fn $name(&mut self, _: $context, $(_: $arg),*) {})*
     )
 }
 

src/test/ui/chalkify/lower_trait.rs

@@ -12,9 +12,9 @@
 
 #[rustc_dump_program_clauses] //~ ERROR program clause dump
 trait Foo<S, T, U> {
-    fn s(S) -> S;
-    fn t(T) -> T;
-    fn u(U) -> U;
+    fn s(_: S) -> S;
+    fn t(_: T) -> T;
+    fn u(_: U) -> U;
 }
 
 fn main() {

src/test/ui/chalkify/lower_trait_higher_rank.rs

@@ -13,7 +13,7 @@
 #[rustc_dump_program_clauses] //~ ERROR program clause dump
 trait Foo<F> where for<'a> F: Fn(&'a (u8, u16)) -> &'a u8
 {
-    fn s(F) -> F;
+    fn s(_: F) -> F;
 }
 
 fn main() {

src/test/ui/chalkify/lower_trait_where_clause.rs

@@ -15,9 +15,9 @@ use std::borrow::Borrow;
 
 #[rustc_dump_program_clauses] //~ ERROR program clause dump
 trait Foo<'a, 'b, S, T, U> where S: Debug, T: Borrow<U>, U: ?Sized, 'a: 'b, U: 'b {
-    fn s(S) -> S;
-    fn t(T) -> T;
-    fn u(U) -> U;
+    fn s(_: S) -> S;
+    fn t(_: T) -> T;
+    fn u(_: U) -> U;
 }
 
 fn main() {