From da81c960272ae0a265f7ded21697d1f09f151ffb Mon Sep 17 00:00:00 2001
From: pavel <pavel.rosicky@easy.cz>
Date: Wed, 25 Mar 2020 01:01:56 +0100
Subject: pry-backtrace frozen bug

---
 lib/pry/commands/pry_backtrace.rb   |  4 +---
 spec/commands/pry_backtrace_spec.rb | 12 ++++++++++++
 2 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 spec/commands/pry_backtrace_spec.rb

diff --git a/lib/pry/commands/pry_backtrace.rb b/lib/pry/commands/pry_backtrace.rb
index 44b6e3b7..d3a1b86c 100644
--- a/lib/pry/commands/pry_backtrace.rb
+++ b/lib/pry/commands/pry_backtrace.rb
@@ -20,9 +20,7 @@ class Pry
       BANNER
 
       def process
-        text = bold('Backtrace:')
-        text << "\n--\n"
-        text << pry_instance.backtrace.join("\n")
+        text = "#{bold('Backtrace:')}\n--\n#{pry_instance.backtrace.join("\n")}"
         pry_instance.pager.page(text)
       end
     end
diff --git a/spec/commands/pry_backtrace_spec.rb b/spec/commands/pry_backtrace_spec.rb
new file mode 100644
index 00000000..320f42f7
--- /dev/null
+++ b/spec/commands/pry_backtrace_spec.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+describe "pry_backtrace" do
+  before do
+    @t = pry_tester
+  end
+
+  it 'should print a backtrace' do
+    @t.process_command 'pry-backtrace'
+    expect(@t.last_output).to start_with('Backtrace:')
+  end
+end
-- 
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