python lark notes

python lark notes 1.non-terminal can not be terminal.

The following is wrong:

?rngConst:INT                                        -> int_const_rng
        |CNAME                                           -> name_const_rng

Because such a BNF means a non-termininal is directly a termininal

But we can use the followin instead:

?type_constr:CNAME -> var_type

| (INT |CNAME) ".." (INT |CNAME) -> range_type