--- parse tree ---
[ Comment
, SoftBreak
, Code
    "typ/math/style-05.typ"
    ( line 2 , column 2 )
    (Show
       (Just
          (FieldAccess
             (Ident (Identifier "equation")) (Ident (Identifier "math"))))
       (Set
          (Ident (Identifier "text"))
          [ KeyValArg (Identifier "font") (Literal (String "Fira Math")) ]))
, SoftBreak
, Equation
    True
    [ Text "v"
    , Code
        "typ/math/style-05.typ"
        ( line 3 , column 5 )
        (FieldAccess
           (Ident (Identifier "eq")) (Ident (Identifier "colon")))
    , Code
        "typ/math/style-05.typ"
        ( line 3 , column 8 )
        (FuncCall
           (Ident (Identifier "vec"))
           [ BlockArg [ Text "1" , Text "+" , Text "2" ]
           , BlockArg
               [ Text "2"
               , Code
                   "typ/math/style-05.typ"
                   ( line 3 , column 21 )
                   (Ident (Identifier "minus"))
               , Text "4"
               ]
           , BlockArg
               [ Code
                   "typ/math/style-05.typ"
                   ( line 3 , column 26 )
                   (FuncCall (Ident (Identifier "sqrt")) [ BlockArg [ Text "3" ] ])
               ]
           , BlockArg
               [ Code
                   "typ/math/style-05.typ"
                   ( line 3 , column 35 )
                   (FuncCall (Ident (Identifier "arrow")) [ BlockArg [ Text "x" ] ])
               ]
           ])
    , Text "+"
    , Text "1"
    ]
, ParBreak
]
--- evaluated ---
document(body: { text(body: [
]), 
                 text(body: [
]), 
                 math.equation(block: true, 
                               body: { text(body: [v]), 
                                       text(body: [≔]), 
                                       math.vec(children: ({ text(body: [1]), 
                                                             text(body: [+]), 
                                                             text(body: [2]) }, 
                                                           { text(body: [2]), 
                                                             text(body: [−]), 
                                                             text(body: [4]) }, 
                                                           math.sqrt(radicand: text(body: [3])), 
                                                           math.accent(accent: →, 
                                                                       base: text(body: [x])))), 
                                       text(body: [+]), 
                                       text(body: [1]) }, 
                               numbering: none), 
                 parbreak() })
