--- parse tree ---
[ Code
    "test/typ/math/attach-01.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/attach-01.typ"
                                 ( line 1 , column 47 )
                                 (FuncCall
                                    (Ident (Identifier "repr"))
                                    [ NormalArg (Ident (Identifier "x")) ])
                             , Space
                             , Text "/"
                             , Text "="
                             , Space
                             , Code
                                 "test/typ/math/attach-01.typ"
                                 ( line 1 , column 59 )
                                 (FuncCall
                                    (Ident (Identifier "repr"))
                                    [ NormalArg (Ident (Identifier "y")) ])
                             , Text ")"
                             ])
                      )
                    ]
                ]))))
, SoftBreak
, Comment
, Comment
, Equation
    True
    [ Code
        "test/typ/math/attach-01.typ"
        ( line 5 , column 1 )
        (FuncCall
           (Ident (Identifier "attach"))
           [ BlockArg
               [ Code
                   "test/typ/math/attach-01.typ"
                   ( line 5 , column 8 )
                   (FuncCall (Ident (Identifier "upright")) [ BlockArg [ Text "O" ] ])
               ]
           , KeyValArg (Identifier "bl") (Block (Content [ Text "8" ]))
           , KeyValArg (Identifier "tl") (Block (Content [ Text "16" ]))
           , KeyValArg (Identifier "br") (Block (Content [ Text "2" ]))
           , KeyValArg
               (Identifier "tr")
               (Block
                  (Content
                     [ Text "2"
                     , Code
                         "test/typ/math/attach-01.typ"
                         ( line 5 , column 47 )
                         (Ident (Identifier "minus"))
                     ]))
           ])
    , Text ","
    , Code
        "test/typ/math/attach-01.typ"
        ( line 6 , column 1 )
        (FuncCall
           (Ident (Identifier "attach"))
           [ BlockArg [ Text "Pb" ]
           , KeyValArg (Identifier "bl") (Block (Content [ Text "82" ]))
           , KeyValArg (Identifier "tl") (Block (Content [ Text "207" ]))
           ])
    , Text "+"
    , Code
        "test/typ/math/attach-01.typ"
        ( line 6 , column 33 )
        (FuncCall
           (Ident (Identifier "attach"))
           [ BlockArg
               [ Code
                   "test/typ/math/attach-01.typ"
                   ( line 6 , column 40 )
                   (FuncCall (Ident (Identifier "upright")) [ BlockArg [ Text "e" ] ])
               ]
           , KeyValArg
               (Identifier "bl")
               (Block
                  (Content
                     [ Code
                         "test/typ/math/attach-01.typ"
                         ( line 6 , column 56 )
                         (Ident (Identifier "minus"))
                     , Text "1"
                     ]))
           , KeyValArg (Identifier "tl") (Block (Content [ Text "0" ]))
           ])
    , Text "+"
    , MAttach
        (Just (Text "e"))
        Nothing
        (Code
           "test/typ/math/attach-01.typ"
           ( line 6 , column 69 )
           (FuncCall (Ident (Identifier "macron")) [ BlockArg [ Text "v" ] ]))
    , HardBreak
    ]
, ParBreak
]
--- evaluated ---
document(body: { text(body: [
]), 
                 math.equation(block: true, 
                               body: { math.attach(base: math.upright(body: text(body: [O])), 
                                                   bl: text(body: [8]), 
                                                   br: text(body: [2]), 
                                                   tl: text(body: [16]), 
                                                   tr: { text(body: [2]), 
                                                         text(body: [−]) }), 
                                       text(body: [,]), 
                                       math.attach(base: text(body: [Pb]), 
                                                   bl: text(body: [82]), 
                                                   tl: text(body: [207])), 
                                       text(body: [+]), 
                                       math.attach(base: math.upright(body: text(body: [e])), 
                                                   bl: { text(body: [−]), 
                                                         text(body: [1]) }, 
                                                   tl: text(body: [0])), 
                                       text(body: [+]), 
                                       math.attach(b: text(body: [e]), 
                                                   base: math.accent(accent: ¯, 
                                                                     base: text(body: [v])), 
                                                   t: none), 
                                       linebreak() }, 
                               numbering: none), 
                 parbreak() })