From 3ab60264b504c1f51b2a9e3dfa20ef0d03bcdaed Mon Sep 17 00:00:00 2001
From: Esteban Küber <esteban@kuber.com.ar>
Date: Thu, 25 Jul 2019 10:11:03 -0700
Subject: Add note suggesting to borrow a String argument to find

---
 src/libcore/ops/function.rs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/libcore')

diff --git a/src/libcore/ops/function.rs b/src/libcore/ops/function.rs
index c69f5fd9896..b9552eaa1a0 100644
--- a/src/libcore/ops/function.rs
+++ b/src/libcore/ops/function.rs
@@ -137,6 +137,10 @@ pub trait Fn<Args> : FnMut<Args> {
 #[rustc_paren_sugar]
 #[rustc_on_unimplemented(
     on(Args="()", note="wrap the `{Self}` in a closure with no arguments: `|| {{ /* code */ }}"),
+    on(
+        all(Args="(char,)", _Self="std::string::String"),
+        note="borrowing the `{Self}` might fix the problem"
+    ),
     message="expected a `{FnMut}<{Args}>` closure, found `{Self}`",
     label="expected an `FnMut<{Args}>` closure, found `{Self}`",
 )]
-- 
cgit 1.4.1-3-g733a5