Assertion `analysis.final_step_indices.size > 0` failed

[alex-s168]

Assertion analysis.final_step_indices.size > 0 failed

When adding this to the queries file, it throws an assertion error.
without it, everything works as expected

Steps to reproduce:

git clone https://gitea.vxcc.dev/alexander.nutz/beginner-friendly-lang.git
git switch topiary-bug-repro
cd tree-sitter
make
topiary fmt --configuration topiary-crepuscular.ncl -l crepuscular -q queries/topiary.scm --skip-idempotence  < example.crr

[Xophmeister]

I'm able to reproduce this, but it's not an error with Topiary. It looks like a Tree-sitter problem:

topiary: /home/chris/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tree-sitter-0.25.9/src/./query.c:1767: ts_query__analyze_patterns: Assertion `analysis.final_step_indices.size > 0' failed.

In particular, this is the line it's failing on:

https://github.com/tree-sitter/tree-sitter/blob/a467ea8502d95562171f97953a6dc5b2a8622609/lib/src/query.c#L1767

It might be worth raising an issue in the Tree-sitter repo to see why your grammar is not passing this assertion. You could also try your grammar with other tools that support Tree-sitter grammars (e.g., Helix, NeoVim, etc.) to see if it suffers from the same problem.

[alex-s168]

tree-sitter/tree-sitter#4872