--- parse tree ---
[ Code
    "test/typ/math/underover-02.typ"
    ( line 1 , column 2 )
    (Let
       (BasicBind (Just (Identifier "test")))
       (FuncExpr
          [ NormalParam (Identifier "x") , NormalParam (Identifier "y") ]
          (Block
             (CodeBlock
                [ If
                    [ ( Equals (Ident (Identifier "x")) (Ident (Identifier "y"))
                      , Block (Content [ Text "\9989" ])
                      )
                    , ( Literal (Boolean True)
                      , Block
                          (Content
                             [ Text "\10060"
                             , Text "("
                             , Code
                                 "test/typ/math/underover-02.typ"
                                 ( line 1 , column 47 )
                                 (FuncCall
                                    (Ident (Identifier "repr"))
                                    [ NormalArg (Ident (Identifier "x")) ])
                             , Space
                             , Text "/"
                             , Text "="
                             , Space
                             , Code
                                 "test/typ/math/underover-02.typ"
                                 ( line 1 , column 59 )
                                 (FuncCall
                                    (Ident (Identifier "repr"))
                                    [ NormalArg (Ident (Identifier "y")) ])
                             , Text ")"
                             ])
                      )
                    ]
                ]))))
, SoftBreak
, Comment
, Equation
    True
    [ Code
        "test/typ/math/underover-02.typ"
        ( line 3 , column 3 )
        (FuncCall
           (Ident (Identifier "underbracket"))
           [ BlockArg
               [ MGroup
                   (Just "[")
                   (Just "]")
                   [ Text "1" , Text "," , MFrac (Text "2") (Text "3") ]
               ]
           , BlockArg [ Text " relevant stuff" ]
           ])
    , Code
        "test/typ/math/underover-02.typ"
        ( line 4 , column 11 )
        (FieldAccess
           (Ident (Identifier "long"))
           (FieldAccess
              (Ident (Identifier "double"))
              (FieldAccess
                 (Ident (Identifier "r"))
                 (FieldAccess
                    (Ident (Identifier "l")) (Ident (Identifier "arrow"))))))
    , Code
        "test/typ/math/underover-02.typ"
        ( line 5 , column 3 )
        (FuncCall
           (Ident (Identifier "overbracket"))
           [ BlockArg
               [ MGroup
                   (Just "[")
                   (Just "]")
                   [ MFrac (Text "4") (Text "5") , Text "," , Text "6" ]
               ]
           , BlockArg [ Text " irrelevant stuff" ]
           ])
    ]
, ParBreak
]
--- evaluated ---
document(body: { text(body: [
]), 
                 math.equation(block: true, 
                               body: { math.underbracket(annotation: text(body: [ relevant stuff]), 
                                                         body: math.lr(body: ({ [[], 
                                                                                text(body: [1]), 
                                                                                text(body: [,]), 
                                                                                math.frac(denom: text(body: [3]), 
                                                                                          num: text(body: [2])), 
                                                                                []] }))), 
                                       text(body: [⟺]), 
                                       math.overbracket(annotation: text(body: [ irrelevant stuff]), 
                                                        body: math.lr(body: ({ [[], 
                                                                               math.frac(denom: text(body: [5]), 
                                                                                         num: text(body: [4])), 
                                                                               text(body: [,]), 
                                                                               text(body: [6]), 
                                                                               []] }))) }, 
                               numbering: none), 
                 parbreak() })