From 3b7a518144ef04c21db1e20a103e896021cc4c2d Mon Sep 17 00:00:00 2001
From: rChaser53 <tayoshizawa29@gmail.com>
Date: Wed, 31 Jul 2019 23:55:58 +0900
Subject: [PATCH] fix underscore in slice patterns are removed (#3719)

---
 src/patterns.rs            | 2 +-
 tests/target/issue-3718.rs | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 tests/target/issue-3718.rs

diff --git a/src/patterns.rs b/src/patterns.rs
index e7b7f8adbb21e..57051a286a785 100644
--- a/src/patterns.rs
+++ b/src/patterns.rs
@@ -133,7 +133,7 @@ impl Rewrite for Pat {
                     .iter()
                     .map(|p| {
                         if let Some(rw) = p.rewrite(context, shape) {
-                            format!("{}", if rw == "_" { "" } else { &rw })
+                            rw
                         } else {
                             format!("{}", context.snippet(p.span))
                         }
diff --git a/tests/target/issue-3718.rs b/tests/target/issue-3718.rs
new file mode 100644
index 0000000000000..8ad21ffc708c7
--- /dev/null
+++ b/tests/target/issue-3718.rs
@@ -0,0 +1,7 @@
+fn main() {
+    let x: &[i32] = &[2, 2];
+    match x {
+        [_a, _] => println!("Wrong username or password"),
+        _ => println!("Logged in"),
+    }
+}