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Lean.Elab.Tactic.BuiltinTactic

Evaluates a tactic script in form of a syntax node with alternating tactics and separators as children.

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    Takes a sepByIndent tactic "; ", and inserts checkpoint blocks for save tactics.

    Input:

      a
      b
      save
      c
      d
      save
      e
    

    Output:

      checkpoint
        a
        b
        save
      checkpoint
        c
        d
        save
      e
    
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