AssertionError when using templates about lark HOT 4 OPEN

_string is a rule template, that can't be used in a terminal. Currently there are no terminal templates. (and the expansion you wrote is not in fact equivalent. rule template generate new rules with impossible-to-recreate names instead of inlining)

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Thanks for letting us know. This is indeed an incorrect grammar, but we should throw a better error message for the user.

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_string is a rule template, that can't be used in a terminal. Currently there are no terminal templates.

Then that should be mentioned at https://lark-parser.readthedocs.io/en/stable/grammar.html#templates

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Yep, that documentation is wrong: templates aren't "expanded", they are instantiated. We had considered adding expanding templates (probably with __ prefix), but haven't gotten around to that.

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