From 6955afe8fd16d51b2c617d69f89a9eac5b7fd150 Mon Sep 17 00:00:00 2001
From: Badel2 <2badel2@gmail.com>
Date: Tue, 23 Nov 2021 22:55:48 +0100
Subject: Fix stack overflow in `usefulness.rs`

---
 src/test/ui/pattern/usefulness/issue-88747.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 src/test/ui/pattern/usefulness/issue-88747.rs

(limited to 'src/test/ui/pattern')

diff --git a/src/test/ui/pattern/usefulness/issue-88747.rs b/src/test/ui/pattern/usefulness/issue-88747.rs
new file mode 100644
index 00000000000..948c99f9ce9
--- /dev/null
+++ b/src/test/ui/pattern/usefulness/issue-88747.rs
@@ -0,0 +1,14 @@
+// check-pass: this used to be a stack overflow because of recursion in `usefulness.rs`
+
+macro_rules! long_tuple_arg {
+    ([$($t:tt)*]#$($h:tt)*) => {
+        long_tuple_arg!{[$($t)*$($t)*]$($h)*}
+    };
+    ([$([$t:tt $y:tt])*]) => {
+        pub fn _f(($($t,)*): ($($y,)*)) {}
+    }
+}
+
+long_tuple_arg!{[[_ u8]]########## ###}
+
+fn main() {}
-- 
cgit 1.4.1-3-g733a5