From be84049570d5be6d6e76e471ef88a11ae46292ad Mon Sep 17 00:00:00 2001
From: xFrednet <xFrednet@gmail.com>
Date: Wed, 9 Mar 2022 21:58:13 +0100
Subject: [PATCH] Add comment about `unfulfilled_lint_expectation` not being in
 a group (RFC 2383)

---
 compiler/rustc_lint/src/levels.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs
index 468aacc9bcaa..99bbe01566a9 100644
--- a/compiler/rustc_lint/src/levels.rs
+++ b/compiler/rustc_lint/src/levels.rs
@@ -357,6 +357,8 @@ impl<'s> LintLevelsBuilder<'s> {
                         // can't be fulfilled. The lint message will include an explanation, that the
                         // `unfulfilled_lint_expectations` lint can't be expected.
                         if let Level::Expect(expect_id) = level {
+                            // The `unfulfilled_lint_expectations` lint is not part of any lint groups. Therefore. we
+                            // only need to check the slice if it contains a single lint.
                             let is_unfulfilled_lint_expectations = match ids {
                                 [lint] => *lint == LintId::of(UNFULFILLED_LINT_EXPECTATIONS),
                                 _ => false,