--- parse tree ---
[ Code
    "test/typ/math/attach-03.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-03.typ"
                                 ( line 1 , column 47 )
                                 (FuncCall
                                    (Ident (Identifier "repr"))
                                    [ NormalArg (Ident (Identifier "x")) ])
                             , Space
                             , Text "/"
                             , Text "="
                             , Space
                             , Code
                                 "test/typ/math/attach-03.typ"
                                 ( line 1 , column 59 )
                                 (FuncCall
                                    (Ident (Identifier "repr"))
                                    [ NormalArg (Ident (Identifier "y")) ])
                             , Text ")"
                             ])
                      )
                    ]
                ]))))
, SoftBreak
, Comment
, Equation
    False
    [ MGroup
        Nothing
        Nothing
        [ MAttach
            (Just (Text "1"))
            Nothing
            (Code
               "test/typ/math/attach-03.typ"
               ( line 3 , column 2 )
               (Ident (Identifier "pi")))
        , MGroup (Just "(") (Just ")") [ Text "Y" ]
        ]
    , Text ","
    , MAttach
        (Just
           (MGroup
              Nothing
              Nothing
              [ Text "f" , MGroup (Just "(") (Just ")") [ Text "x" ] ]))
        Nothing
        (Text "a")
    , Text ","
    , MAttach
        Nothing
        (Just
           (Code
              "test/typ/math/attach-03.typ"
              ( line 3 , column 21 )
              (FuncCall (Ident (Identifier "zeta")) [ BlockArg [ Text "x" ] ])))
        (Text "a")
    , HardBreak
    , MAttach
        Nothing
        (Just
           (Code
              "test/typ/math/attach-03.typ"
              ( line 4 , column 4 )
              (FuncCall
                 (FieldAccess
                    (Ident (Identifier "eq")) (Ident (Identifier "subset")))
                 [ BlockArg [ Text "x" ] ])))
        (Text "a")
    , Text ","
    , MAttach
        (Just
           (MGroup
              Nothing
              Nothing
              [ Code
                  "test/typ/math/attach-03.typ"
                  ( line 4 , column 21 )
                  (FuncCall (Ident (Identifier "zeta")) [ BlockArg [ Text "x" ] ])
              ]))
        Nothing
        (Text "a")
    , Text ","
    , MAttach
        (Just
           (MGroup
              Nothing
              Nothing
              [ MGroup
                  Nothing
                  Nothing
                  [ Text "1" , MGroup (Just "(") (Just ")") [ Text "Y" ] ]
              ]))
        Nothing
        (Code
           "test/typ/math/attach-03.typ"
           ( line 4 , column 31 )
           (Ident (Identifier "pi")))
    ]
, ParBreak
]
--- evaluated ---
document(body: { text(body: [
]), 
                 math.equation(block: false, 
                               body: { math.attach(b: text(body: [1]), 
                                                   base: text(body: [π]), 
                                                   t: none), 
                                       math.lr(body: ({ [(], 
                                                        text(body: [Y]), 
                                                        [)] })), 
                                       text(body: [,]), 
                                       math.attach(b: { text(body: [f]), 
                                                        math.lr(body: ({ [(], 
                                                                         text(body: [x]), 
                                                                         [)] })) }, 
                                                   base: text(body: [a]), 
                                                   t: none), 
                                       text(body: [,]), 
                                       math.attach(b: none, 
                                                   base: text(body: [a]), 
                                                   t: { text(body: [ζ]), 
                                                        text(body: [(]), 
                                                        text(body: [x]), 
                                                        text(body: [)]) }), 
                                       linebreak(), 
                                       math.attach(b: none, 
                                                   base: text(body: [a]), 
                                                   t: { text(body: [⊆]), 
                                                        text(body: [(]), 
                                                        text(body: [x]), 
                                                        text(body: [)]) }), 
                                       text(body: [,]), 
                                       math.attach(b: { text(body: [ζ]), 
                                                        text(body: [(]), 
                                                        text(body: [x]), 
                                                        text(body: [)]) }, 
                                                   base: text(body: [a]), 
                                                   t: none), 
                                       text(body: [,]), 
                                       math.attach(b: { text(body: [1]), 
                                                        math.lr(body: ({ [(], 
                                                                         text(body: [Y]), 
                                                                         [)] })) }, 
                                                   base: text(body: [π]), 
                                                   t: none) }, 
                               numbering: none), 
                 parbreak() })