[ BlockLemma
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 1
        , sourceColumn = Pos 1
        }
    )
    ( Marker "trivial" )
    ( Lemma []
        ( StmtFormula
            ( FormulaChain
                ( ChainBase
                    ( ExprVar
                        ( NamedVar "x" ) :| []
                    ) Positive
                    ( RelationSymbol
                        ( Symbol "=" )
                    )
                    ( ExprVar
                        ( NamedVar "x" ) :| []
                    )
                )
            )
        )
    )
, BlockLemma
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 5
        , sourceColumn = Pos 1
        }
    )
    ( Marker "irrelevant" )
    ( Lemma []
        ( StmtFormula
            ( FormulaChain
                ( ChainBase
                    ( ExprVar
                        ( NamedVar "z" ) :| []
                    ) Positive
                    ( RelationSymbol
                        ( Symbol "=" )
                    )
                    ( ExprVar
                        ( NamedVar "z" ) :| []
                    )
                )
            )
        )
    )
, BlockLemma
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 9
        , sourceColumn = Pos 1
        }
    )
    ( Marker "alsotrivial" )
    ( Lemma []
        ( StmtFormula
            ( FormulaChain
                ( ChainBase
                    ( ExprVar
                        ( NamedVar "y" ) :| []
                    ) Positive
                    ( RelationSymbol
                        ( Symbol "=" )
                    )
                    ( ExprVar
                        ( NamedVar "y" ) :| []
                    )
                )
            )
        )
    )
, BlockProof
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 12
        , sourceColumn = Pos 1
        }
    )
    ( Calc Nothing
        ( Equation
            ( ExprVar
                ( NamedVar "y" )
            )
            (
                ( ExprVar
                    ( NamedVar "y" )
                , JustificationEmpty
                ) :|
                [
                    ( ExprVar
                        ( NamedVar "y" )
                    , JustificationRef
                        ( Marker "trivial" :| [] )
                    )
                ]
            )
        ) ( Qed JustificationEmpty )
    )
, BlockLemma
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 22
        , sourceColumn = Pos 1
        }
    )
    ( Marker "trivial_biconditionals" )
    ( Lemma []
        ( StmtFormula
            ( FormulaChain
                ( ChainBase
                    ( ExprVar
                        ( NamedVar "y" ) :| []
                    ) Positive
                    ( RelationSymbol
                        ( Symbol "=" )
                    )
                    ( ExprVar
                        ( NamedVar "y" ) :| []
                    )
                )
            )
        )
    )
, BlockProof
    ( SourcePos
        { sourceName = "test/examples/calc.tex"
        , sourceLine = Pos 25
        , sourceColumn = Pos 1
        }
    )
    ( Calc Nothing
        ( Biconditionals
            ( FormulaChain
                ( ChainBase
                    ( ExprVar
                        ( NamedVar "y" ) :| []
                    ) Positive
                    ( RelationSymbol
                        ( Symbol "=" )
                    )
                    ( ExprVar
                        ( NamedVar "y" ) :| []
                    )
                )
            )
            (
                ( PropositionalConstant IsTop
                , JustificationEmpty
                ) :|
                [
                    ( FormulaChain
                        ( ChainBase
                            ( ExprVar
                                ( NamedVar "y" ) :| []
                            ) Positive
                            ( RelationSymbol
                                ( Symbol "=" )
                            )
                            ( ExprVar
                                ( NamedVar "y" ) :| []
                            )
                        )
                    , JustificationRef
                        ( Marker "trivial" :| [] )
                    )
                ]
            )
        ) ( Qed JustificationEmpty )
    )
]