Update imports and rustup

clippy_lints/src/invalid_ref.rs

@@ -1,4 +1,4 @@
-use rustc::lint::*;
+use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::{declare_lint, lint_array};
 use if_chain::if_chain;
 use rustc::ty;