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-rw-r--r--lib/rack/show_exceptions.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/rack/show_exceptions.rb b/lib/rack/show_exceptions.rb
index ca86b2b2..6d7c5253 100644
--- a/lib/rack/show_exceptions.rb
+++ b/lib/rack/show_exceptions.rb
@@ -55,7 +55,7 @@ module Rack
private :accepts_html?
def dump_exception(exception)
- string = "#{exception.class}: #{exception.message}\n"
+ string = "#{exception.class}: #{exception.message}\n".dup
string << exception.backtrace.map { |l| "\t#{l}" }.join("\n")
string
end