// retoor <retoor@molodetz.nl>
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import "yaml" for Yaml
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var empty = Yaml.parse("")
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System.print(empty) // expect: null
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var nullInput = Yaml.parse(null)
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System.print(nullInput) // expect: null
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var whitespace = Yaml.parse(" \n \n ")
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System.print(whitespace) // expect: null
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