[ BlockLemma
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 1
        , sourceColumn = Pos 1
        }
    )
    ( Marker "trivial" )
    ( Lemma []
        ( TermSymbol
            ( SymbolPredicate
                ( PredicateRelation
                    ( Symbol "=" )
                )
            )
            [ TermVar
                ( NamedVar "x" )
            , TermVar
                ( NamedVar "x" )
            ]
        )
    )
, BlockLemma
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 5
        , sourceColumn = Pos 1
        }
    )
    ( Marker "irrelevant" )
    ( Lemma []
        ( TermSymbol
            ( SymbolPredicate
                ( PredicateRelation
                    ( Symbol "=" )
                )
            )
            [ TermVar
                ( NamedVar "z" )
            , TermVar
                ( NamedVar "z" )
            ]
        )
    )
, BlockLemma
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 9
        , sourceColumn = Pos 1
        }
    )
    ( Marker "alsotrivial" )
    ( Lemma []
        ( TermSymbol
            ( SymbolPredicate
                ( PredicateRelation
                    ( Symbol "=" )
                )
            )
            [ TermVar
                ( NamedVar "y" )
            , TermVar
                ( NamedVar "y" )
            ]
        )
    )
, BlockProof
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 12
        , sourceColumn = Pos 1
        }
    )
    ( Calc
        ( Equation
            ( TermVar
                ( NamedVar "y" )
            )
            (
                ( TermVar
                    ( NamedVar "y" )
                , JustificationEmpty
                ) :|
                [
                    ( TermVar
                        ( NamedVar "y" )
                    , JustificationRef
                        ( Marker "trivial" :| [] )
                    )
                ]
            )
        ) ( Qed JustificationEmpty )
    )
, BlockLemma
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 22
        , sourceColumn = Pos 1
        }
    )
    ( Marker "trivial_biconditionals" )
    ( Lemma []
        ( TermSymbol
            ( SymbolPredicate
                ( PredicateRelation
                    ( Symbol "=" )
                )
            )
            [ TermVar
                ( NamedVar "y" )
            , TermVar
                ( NamedVar "y" )
            ]
        )
    )
, BlockProof
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 25
        , sourceColumn = Pos 1
        }
    )
    ( Calc
        ( Biconditionals
            ( TermSymbol
                ( SymbolPredicate
                    ( PredicateRelation
                        ( Symbol "=" )
                    )
                )
                [ TermVar
                    ( NamedVar "y" )
                , TermVar
                    ( NamedVar "y" )
                ]
            )
            (
                ( PropositionalConstant IsTop
                , JustificationEmpty
                ) :|
                [
                    ( TermSymbol
                        ( SymbolPredicate
                            ( PredicateRelation
                                ( Symbol "=" )
                            )
                        )
                        [ TermVar
                            ( NamedVar "y" )
                        , TermVar
                            ( NamedVar "y" )
                        ]
                    , JustificationRef
                        ( Marker "trivial" :| [] )
                    )
                ]
            )
        ) ( Qed JustificationEmpty )
    )
]