librustc: Add a lint mode for unnecessary `copy` and remove a bunch of them.

2 files changed, 12 insertions, 4 deletions

diff --git a/src/libsyntax/print/pp.rs b/src/libsyntax/print/pp.rs
index 7cd3faf9a90..8889fe91cc5 100644
--- a/src/libsyntax/print/pp.rs
+++ b/src/libsyntax/print/pp.rs
@@ -424,7 +424,7 @@ impl Printer {
     pub fn check_stack(&mut self, k: int) {
         if !self.scan_stack_empty {
             let x = self.scan_top();
-            match copy self.token[x] {
+            match self.token[x] {
               BEGIN(_) => {
                 if k > 0 {
                     self.size[self.scan_pop()] = self.size[x] +
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index 67d5f4aa845..5b4a6d15a12 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -803,9 +803,17 @@ pub fn print_ty_method(s: @ps, m: &ast::ty_method) {
     hardbreak_if_not_bol(s);
     maybe_print_comment(s, m.span.lo);
     print_outer_attributes(s, m.attrs);
-    print_ty_fn(s, None, None, &None, m.purity, ast::Many,
-                &m.decl, Some(m.ident), &None, Some(&m.generics),
-                Some(/*bad*/ copy m.explicit_self.node));
+    print_ty_fn(s,
+                None,
+                None,
+                &None,
+                m.purity,
+                ast::Many,
+                &m.decl,
+                Some(m.ident),
+                &None,
+                Some(&m.generics),
+                Some(m.explicit_self.node));
     word(s.s, ";");
 }