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-rw-r--r--lib/puppet/parser/functions/empty.rb3
1 files changed, 1 insertions, 2 deletions
diff --git a/lib/puppet/parser/functions/empty.rb b/lib/puppet/parser/functions/empty.rb
index 80ebb86..cca620f 100644
--- a/lib/puppet/parser/functions/empty.rb
+++ b/lib/puppet/parser/functions/empty.rb
@@ -12,9 +12,8 @@ Returns true if the variable is empty.
"given (#{arguments.size} for 1)") if arguments.size < 1
value = arguments[0]
- klass = value.class
- unless [Array, Hash, String].include?(klass)
+ unless value.is_a?(Array) || value.is_a?(Hash) || value.is_a?(String)
raise(Puppet::ParseError, 'empty(): Requires either ' +
'array, hash or string to work with')
end