Rustup to rust-lang/rust#66878

clippy_lints/src/empty_enum.rs

@@ -1,9 +1,10 @@
 //! lint when there is an enum with no variants
 
 use crate::utils::span_lint_and_then;
+use rustc::declare_lint_pass;
 use rustc::hir::*;
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
-use rustc::{declare_lint_pass, declare_tool_lint};
+use rustc_session::declare_tool_lint;
 
 declare_clippy_lint! {
     /// **What it does:** Checks for `enum`s with no variants.