From ee05fc8104e5e2fecf8f67fc3d4259d5d576a20f Mon Sep 17 00:00:00 2001
From: Andre Bogus <bogusandre@gmail.com>
Date: Thu, 20 Jun 2019 14:36:53 +0200
Subject: [PATCH] First question mark in doctest

---
 src/libcore/macros.rs | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/libcore/macros.rs b/src/libcore/macros.rs
index 8b44025f91f..4648f1a006e 100644
--- a/src/libcore/macros.rs
+++ b/src/libcore/macros.rs
@@ -335,11 +335,14 @@ macro_rules! r#try {
 /// ```
 /// use std::io::Write;
 ///
-/// let mut w = Vec::new();
-/// write!(&mut w, "test").unwrap();
-/// write!(&mut w, "formatted {}", "arguments").unwrap();
+/// fn main() -> std::io::Result<()> {
+///     let mut w = Vec::new();
+///     write!(&mut w, "test")?;
+///     write!(&mut w, "formatted {}", "arguments")?;
 ///
-/// assert_eq!(w, b"testformatted arguments");
+///     assert_eq!(w, b"testformatted arguments");
+///     Ok(())
+/// }
 /// ```
 ///
 /// A module can import both `std::fmt::Write` and `std::io::Write` and call `write!` on objects