From 10b9afa9061899f5e2db4be864655ee9d3a110d4 Mon Sep 17 00:00:00 2001
From: Igor Matuszewski <Xanewok@gmail.com>
Date: Sat, 8 Dec 2018 22:32:35 +0100
Subject: [PATCH] Add test asserting we catch Rust parser panics

---
 src/test/mod.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/test/mod.rs b/src/test/mod.rs
index 599f83cd49ca..77abc3c8558d 100644
--- a/src/test/mod.rs
+++ b/src/test/mod.rs
@@ -288,6 +288,18 @@ fn stdin_formatting_smoke_test() {
     assert_eq!(buf, "fn main() {}\r\n".as_bytes());
 }
 
+#[test]
+fn stdin_parser_panic_caught() {
+    // https://github.com/rust-lang/rustfmt/issues/3239
+    for text in ["{", "}"].iter().cloned().map(String::from) {
+        let mut buf = vec![];
+        let mut session = Session::new(Default::default(), Some(&mut buf));
+        let _ = session.format(Input::Text(text));
+
+        assert!(session.has_parsing_errors());
+    }
+}
+
 #[test]
 fn stdin_disable_all_formatting_test() {
     match option_env!("CFG_RELEASE_CHANNEL") {