--- parse tree ---
[ Code
    "test/typ/math/matrix-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/matrix-02.typ"
                                 ( line 1 , column 47 )
                                 (FuncCall
                                    (Ident (Identifier "repr"))
                                    [ NormalArg (Ident (Identifier "x")) ])
                             , Space
                             , Text "/"
                             , Text "="
                             , Space
                             , Code
                                 "test/typ/math/matrix-02.typ"
                                 ( line 1 , column 59 )
                                 (FuncCall
                                    (Ident (Identifier "repr"))
                                    [ NormalArg (Ident (Identifier "y")) ])
                             , Text ")"
                             ])
                      )
                    ]
                ]))))
, SoftBreak
, Comment
, Equation
    True
    [ Code
        "test/typ/math/matrix-02.typ"
        ( line 3 , column 3 )
        (FuncCall
           (Ident (Identifier "mat"))
           [ ArrayArg
               [ [ Text "a" , MAttach Nothing (Just (Text "2")) (Text "b") ]
               , [ MGroup
                     Nothing
                     Nothing
                     [ MAttach
                         (Just (MGroup Nothing Nothing [ Text "x" , HardBreak , Text "y" ]))
                         Nothing
                         (Code
                            "test/typ/math/matrix-02.typ"
                            ( line 5 , column 3 )
                            (Ident (Identifier "sum")))
                     , Text "x"
                     ]
                 , MAttach
                     Nothing
                     (Just (MGroup Nothing Nothing [ MFrac (Text "1") (Text "2") ]))
                     (Text "a")
                 ]
               , [ Code
                     "test/typ/math/matrix-02.typ"
                     ( line 6 , column 3 )
                     (Ident (Identifier "zeta"))
                 , Code
                     "test/typ/math/matrix-02.typ"
                     ( line 6 , column 9 )
                     (Ident (Identifier "alpha"))
                 ]
               ]
           ])
    ]
, ParBreak
]
--- evaluated ---
document(body: { text(body: [
]), 
                 math.equation(block: true, 
                               body: math.mat(rows: ((text(body: [a]), 
                                                      math.attach(b: none, 
                                                                  base: text(body: [b]), 
                                                                  t: text(body: [2]))), 
                                                     ({ math.attach(b: { text(body: [x]), 
                                                                         linebreak(), 
                                                                         text(body: [y]) }, 
                                                                    base: text(body: [∑]), 
                                                                    t: none), 
                                                        text(body: [x]) }, 
                                                      math.attach(b: none, 
                                                                  base: text(body: [a]), 
                                                                  t: math.frac(denom: text(body: [2]), 
                                                                               num: text(body: [1])))), 
                                                     (text(body: [ζ]), 
                                                      text(body: [α])))), 
                               numbering: none), 
                 parbreak() })