Update rust-clippy to rustc 1.9.0-nightly (d5a91e695 2016-03-26)

move cfg, infer, traits and ty from middle to top-level
move middle::subst into middle::ty
track the extern-crate def-id rather than path (rustc ab9b844)

src/array_indexing.rs

@@ -1,7 +1,7 @@
 use rustc::lint::*;
 use rustc::middle::const_eval::EvalHint::ExprTypeChecked;
 use rustc::middle::const_eval::{eval_const_expr_partial, ConstVal};
-use rustc::middle::ty::TyArray;
+use rustc::ty::TyArray;
 use rustc_front::hir::*;
 use rustc_const_eval::ConstInt;
 use syntax::ast::RangeLimits;