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/Ruby 2.4

class SecurityError

Parent:
Exception

Raised when attempting a potential unsafe operation, typically when the $SAFE level is raised above 0.

foo = "bar"
proc = Proc.new do
  $SAFE = 3
  foo.untaint
end
proc.call

raises the exception:

SecurityError: Insecure: Insecure operation `untaint' at level 3

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