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Allow allowing of toplevel_ref_arg lint #4007

merged 1 commit into from Apr 20, 2019
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Just for now

@@ -13,8 +13,8 @@ use crate::consts::{constant, Constant};
use crate::utils::sugg::Sugg;
use crate::utils::{
get_item_name, get_parent_expr, implements_trait, in_constant, in_macro, is_integer_literal, iter_input_pats,
last_path_segment, match_qpath, match_trait_method, paths, snippet, span_lint, span_lint_and_then, walk_ptrs_ty,
last_path_segment, match_qpath, match_trait_method, paths, snippet, span_lint, span_lint_and_then,
span_lint_hir_and_then, walk_ptrs_ty, SpanlessEq,

declare_clippy_lint! {
@@ -282,19 +282,20 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for MiscLints {
if let Some(ref init) = l.init;
then {
if an == BindingAnnotation::Ref || an == BindingAnnotation::RefMut {
let init = Sugg::hir(cx, init, "..");
let sugg_init = Sugg::hir(cx, init, "..");
let (mutopt,initref) = if an == BindingAnnotation::RefMut {
("mut ", init.mut_addr())
("mut ", sugg_init.mut_addr())
} else {
("", init.addr())
("", sugg_init.addr())
let tyopt = if let Some(ref ty) = l.ty {
format!(": &{mutopt}{ty}", mutopt=mutopt, ty=snippet(cx, ty.span, "_"))
} else {
"`ref` on an entire `let` pattern is discouraged, take a reference with `&` instead",
|db| {
@@ -22,4 +22,8 @@ fn main() {

let (ref x, _) = (1, 2); // ok, not top level
println!("The answer is {}.", x);

// Make sure that allowing the lint works
let ref mut x = 1_234_543;
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