From 5cfe2a5fc621092ef4a14c22e2855fa07b690cac Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Tue, 25 May 2021 17:13:15 +0200
Subject: [PATCH] Add new suggestion to array_into_iter lint.

---
 compiler/rustc_lint/src/array_into_iter.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/compiler/rustc_lint/src/array_into_iter.rs b/compiler/rustc_lint/src/array_into_iter.rs
index 92c6ae352925..738c63c3b8b4 100644
--- a/compiler/rustc_lint/src/array_into_iter.rs
+++ b/compiler/rustc_lint/src/array_into_iter.rs
@@ -110,6 +110,14 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
                     "iter".into(),
                     Applicability::MachineApplicable,
                 )
+                .multipart_suggestion(
+                    "or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value",
+                    vec![
+                        (expr.span.shrink_to_lo(), "IntoIterator::into_iter(".into()),
+                        (receiver_arg.span.shrink_to_hi().to(expr.span.shrink_to_hi()), ")".into()),
+                    ],
+                    Applicability::MaybeIncorrect,
+                )
                 .emit();
             })
         }