plus_minus, minus_plus are not recognized as unary ops

[o314]

import CSTParser as C
using Test

_eval_or_ex(a) = try; a catch ex; ex end
_backtest_parse(s) = (s |> Meta.parse) == (s |> C.parse |> Expr)
_log_parse(s) =  s |> Meta.parse |> Meta.show_sexpr

±(x) = (0.99,1.01) .* x
@test ± 1000 == (990, 1010)

@test_broken """ ± 1000 """ |> _backtest_parse # see unary-ops @ julia-parser.scm