From 85c3b55e2b77975370dcd0c07b953d281a9c8d07 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Sun, 28 Apr 2019 15:16:47 +0200
Subject: [PATCH] Fix exception in exception.

---
 Library/Homebrew/cask/exceptions.rb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Library/Homebrew/cask/exceptions.rb b/Library/Homebrew/cask/exceptions.rb
index 401203f8ae..13e04a008a 100644
--- a/Library/Homebrew/cask/exceptions.rb
+++ b/Library/Homebrew/cask/exceptions.rb
@@ -174,7 +174,7 @@ module Cask
     end
 
     def to_s
-      s = "Failed to quarantine #{path}."
+      s = +"Failed to quarantine #{path}."
 
       unless reason.empty?
         s << " Here's the reason:\n"
@@ -188,7 +188,7 @@ module Cask
 
   class CaskQuarantinePropagationError < CaskQuarantineError
     def to_s
-      s = "Failed to quarantine one or more files within #{path}."
+      s = +"Failed to quarantine one or more files within #{path}."
 
       unless reason.empty?
         s << " Here's the reason:\n"
@@ -202,7 +202,7 @@ module Cask
 
   class CaskQuarantineReleaseError < CaskQuarantineError
     def to_s
-      s = "Failed to release #{path} from quarantine."
+      s = +"Failed to release #{path} from quarantine."
 
       unless reason.empty?
         s << " Here's the reason:\n"