+use clippy_utils::diagnostics::span_lint;
use if_chain::if_chain;
use rustc_hir::{BinOpKind, Expr, ExprKind, UnOp};
use rustc_lint::{LateContext, LateLintPass};
use rustc_span::source_map::Span;
use crate::consts::{self, Constant};
-use crate::utils::span_lint;
declare_clippy_lint! {
/// **What it does:** Checks for multiplication by -1 as a form of negation.