Fix fallout

clippy_lints/src/approx_const.rs

@@ -1,5 +1,5 @@
 use crate::utils::span_lint;
-use rustc_hir::*;
+use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::symbol;