If-Statements

======

if a == "test" then
  print "test"
else
  print "no test"

if 1 != 1 then {
  let a = 1
  a + 1
}

======

(file
  (statement
    (expr
      (if
        (expr
          (infix_expr
            (ident: "a")
            (operator: "==")
            (literal
              (string: "test")
            )
          )
        )
        (expr
          (call_expr
            (ident: "print")
            (literal
              (string: "test")
            )
          )
        )
        (expr
          (call_expr
            (ident: "print")
            (literal
              (string: "no test")
            )
          )
        )
      )
    )
  )
  (statement
    (expr
      (if
        (expr
          (infix_expr
            (literal
              (integer: "1")
            )
            (operator: "!=")
            (literal
              (integer: "1")
            )
          )
        )
        (expr
          (block
            (statement
              (decl
                (ident: "a")
                (expr
                  (literal
                    (integer: "1")
                  )
                )
              )
            )
            (statement
              (expr
                (infix_expr
                  (ident: "a")
                  (operator: "+")
                  (literal
                    (integer: "1")
                  )
                )
              )
            )
          )
        )
      )
    )
  )
  (EOI: "")
)