src/Pure/ML-Systems/ml_parse_tree_polyml-5.5.3.ML
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(*  Title:      Pure/ML/ml_parse_tree_polyml-5.5.3.ML
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    Author:     Makarius
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Additional ML parse tree components for Poly/ML 5.5.3, or later.
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*)
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structure ML_Parse_Tree: ML_PARSE_TREE =
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struct
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fun completions (PolyML.PTcompletions x) = SOME x
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  | completions _ = NONE;
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fun breakpoint (PolyML.PTbreakPoint x) = SOME x
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  | breakpoint _ = NONE;
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end;