Naming nested parses causes inside nodes to be duplicated in the AST about tatsu HOT 2 CLOSED

This is the expected and documented behavior.

You may want to rewrite your grammar as something like:

grammar = all: (one two) ;

one = one: "a"; 

two = two:"b" ;

from tatsu.

You may reopen with a pull request that provides the desired behavior without breaking existing unit tests.

I do think that the behavior you seek is reasonable, but I think it would break automatic model generation.

The task is in part to define how the desidred JSON output should map to Python @dataclass objects.

from tatsu.