From 4cac9786c527bf4f9e14bfc03e8b5adf5cef2b1d Mon Sep 17 00:00:00 2001
From: pmk21 <prithvikrishna49@gmail.com>
Date: Tue, 31 Mar 2020 15:50:15 +0530
Subject: [PATCH] Skip single_match lints in macro rules

---
 clippy_lints/src/matches.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/clippy_lints/src/matches.rs b/clippy_lints/src/matches.rs
index a124bf8b8..20b793f95 100644
--- a/clippy_lints/src/matches.rs
+++ b/clippy_lints/src/matches.rs
@@ -447,6 +447,11 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Matches {
 #[rustfmt::skip]
 fn check_single_match(cx: &LateContext<'_, '_>, ex: &Expr<'_>, arms: &[Arm<'_>], expr: &Expr<'_>) {
     if arms.len() == 2 && arms[0].guard.is_none() && arms[1].guard.is_none() {
+        if in_macro(expr.span) {
+            // Don't lint match expressions present in
+            // macro_rules! block
+            return;
+        }
         if let PatKind::Or(..) = arms[0].pat.kind {
             // don't lint for or patterns for now, this makes
             // the lint noisy in unnecessary situations