use if_chain::if_chain;
-use matches::matches;
use rustc::ty;
+use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::source_map::{ExpnKind, Span};
-use syntax::ast::LitKind;
use crate::consts::{constant, Constant};
use crate::utils::sugg::Sugg;