`where` keyword not properly parsed

[mroavi]

Input:

function norm(p::Point{T} where T<:Real)
    sqrt(p.x^2 + p.y^2)
end

Output:

function_definition [0, 0] - [2, 3]
    name: identifier [0, 9] - [0, 13]
    parametere: parameter_list [0, 13] - [0, 40]
      typed_parameter [0, 14] - [0, 25]
        identifier [0, 14] - [0, 15]
        parameterized_identifier [0, 17] - [0, 25]
          identifier [0, 17] - [0, 22]
          type_argument_list [0, 22] - [0, 25]
            identifier [0, 23] - [0, 24]
      ERROR [0, 26] - [0, 39]
        identifier [0, 26] - [0, 31]
        identifier [0, 32] - [0, 33]
        identifier [0, 35] - [0, 39]
    call_expression [1, 4] - [1, 23]
      identifier [1, 4] - [1, 8]
      argument_list [1, 8] - [1, 23]
        binary_expression [1, 9] - [1, 22]
          binary_expression [1, 9] - [1, 14]
            field_expression [1, 9] - [1, 12]
              identifier [1, 9] - [1, 10]
              identifier [1, 11] - [1, 12]
            number [1, 13] - [1, 14]
          binary_expression [1, 17] - [1, 22]
            field_expression [1, 17] - [1, 20]
              identifier [1, 17] - [1, 18]
              identifier [1, 19] - [1, 20]
            number [1, 21] - [1, 22]

The input code was taken from the Parametric Composite Types section of the Julia docs.