Remove unused trait imports introduced while in review

Author: sanxiyn

src/libsyntax/errors/emitter.rs

@@ -10,7 +10,7 @@
 
 use self::Destination::*;
 
-use codemap::{self, COMMAND_LINE_SP, DUMMY_SP, Pos, Span, MultiSpan};
+use codemap::{self, COMMAND_LINE_SP, DUMMY_SP, Span, MultiSpan};
 use diagnostics;
 
 use errors::check_old_skool;

src/libsyntax_ext/deriving/clone.rs

@@ -12,7 +12,7 @@ use deriving::generic::*;
 use deriving::generic::ty::*;
 
 use syntax::ast::{Expr, ItemKind, Generics, MetaItem, VariantData};
-use syntax::attr::{self, AttrMetaMethods};
+use syntax::attr;
 use syntax::codemap::Span;
 use syntax::ext::base::{ExtCtxt, Annotatable};
 use syntax::ext::build::AstBuilder;