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Widen the definable position of parameterizing rules #420

Merged

ydah merged 1 commit into ruby:master from ydah:definable-position-rule

Jun 29, 2024

Commits on Jun 26, 2024

Widen the definable position of parameterizing rules

We came to this decision after discussion at RubyKaigi 2024.
Definitions are also possible in the following positions:

```
%rule defined_option(X): /* empty */
                       | X
                       ;

%%

program         : defined_option(number) <i>
                | defined_list(number) <i>
                ;

%rule defined_list(X): /* empty */  /* <--- here */
                     | defined_list(X) number
                     ;
```

ydah committed Jun 26, 2024