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Re:Puffs: Parsing Untrusted File Formats Safely by mnarayan01 on Thursday November 16, 2017 @11:13AM (#15713791)
Consider:

  2-3^4
Re:Puffs: Parsing Untrusted File Formats Safely by irishsultan on Thursday November 16, 2017 @12:18PM (#15714470)
Since there is no precedence in this (hypothetical) language that would be an invalid expression.