Parse error when hex or binary number contains trailing separator

[fstxz]

Code:

func test4():
	print(123_45_6_)
	print(0x1234_00_f_f_)
	print(0b1001_01_0_1_)

(source [0, 0] - [4, 0]
  (function_definition [0, 0] - [3, 22]
    name: (name [0, 5] - [0, 10])
    parameters: (parameters [0, 10] - [0, 12])
    body: (body [0, 13] - [3, 22]
      (expression_statement [1, 1] - [1, 17]
        (call [1, 1] - [1, 17]
          (identifier [1, 1] - [1, 6])
          arguments: (arguments [1, 6] - [1, 17]
            (integer [1, 7] - [1, 16]))))
      (expression_statement [2, 1] - [2, 22]
        (call [2, 1] - [2, 22]
          (identifier [2, 1] - [2, 6])
          arguments: (arguments [2, 6] - [2, 22]
            (integer [2, 7] - [2, 20])
            (ERROR [2, 20] - [2, 21]))))
      (expression_statement [3, 1] - [3, 22]
        (call [3, 1] - [3, 22]
          (identifier [3, 1] - [3, 6])
          arguments: (arguments [3, 6] - [3, 22]
            (integer [3, 7] - [3, 20])
            (ERROR [3, 20] - [3, 21])))))))