numeric_subsup.test

<<< tex
x_1^23+x^1_23+x_12^3+x^12_3
>>> native
[ ESubsup (EIdentifier "x") (ENumber "1") (ENumber "2")
, ENumber "3"
, ESymbol Bin "+"
, ESubsup (EIdentifier "x") (ENumber "2") (ENumber "1")
, ENumber "3"
, ESymbol Bin "+"
, ESub (EIdentifier "x") (ENumber "1")
, ESuper (ENumber "2") (ENumber "3")
, ESymbol Bin "+"
, ESuper (EIdentifier "x") (ENumber "1")
, ESub (ENumber "2") (ENumber "3")
]