Declaration Test

======

let a = 1 + 1
let b = a + 2

======

(file
  (statement
    (decl
      (ident: "a")
      (expr
        (infix_expr
          (literal
            (integer: "1")
          )
          (operator: "+")
          (literal
            (integer: "1")
          )
        )
      )
    )
  )
  (statement
    (decl
      (ident: "b")
      (expr
        (infix_expr
          (ident: "a")
          (operator: "+")
          (literal
            (integer: "2")
          )
        )
      )
    )
  )
  (EOI: "")
)