"generally you want to avoid `&mut &mut _` if possible",
);
} else if let ty::Ref(_, ty, hir::Mutability::Mut) = self.cx.typeck_results().expr_ty(e).kind() {
- if ty.peel_refs().is_sized(self.cx.tcx.at(expr.span), self.cx.param_env) {
+ if ty.peel_refs().is_sized(self.cx.tcx, self.cx.param_env) {
span_lint(
self.cx,
MUT_MUT,