sexp.rb in slim_lint-0.16.0

- old
+ new

@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 module SlimLint
   # Symbolic expression which represents tree-structured data.
   #
   # The main use of this particular implementation is to provide a single
   # location for defining convenience helpers when operating on Sexps.
@@ -76,10 +78,10 @@
     #
     # @param depth [Integer] indentation level to display Sexp at
     # @return [String]
     def display(depth = 1) # rubocop:disable Metrics/AbcSize
       indentation = ' ' * 2 * depth
-      output = '['
+      output = '['.dup
 
       each_with_index do |nested_sexp, index|
         output << "\n"
         output += indentation
 