+use rustc_hir as hir;
+use rustc_hir::intravisit::FnKind;
+use rustc_hir::{Body, FnDecl, HirId, ItemKind, MutTy, Mutability, Node};
+use rustc_lint::{LateContext, LateLintPass};
+use rustc_middle::ty;
+use rustc_session::config::Config as SessionConfig;
+use rustc_session::{declare_tool_lint, impl_lint_pass};
+use rustc_span::Span;