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Fix write zipper node stack after prune_path - #109

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imlvts:fix/prune-path-node-stack
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imlvts:fix/prune-path-node-stack

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@imlvts

@imlvts imlvts commented Sep 16, 2026

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prune_path walked the node stack up to find where pruning stops but left it there when the zipper did not move, so the next write through the focus went to the wrong node (get_val_or_set_mut panicked). Walk the stack back down.

prune_path walked the node stack up to find where pruning stops but left it
there when the zipper did not move, so the next write through the focus went
to the wrong node (get_val_or_set_mut panicked). Walk the stack back down.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019R2H8fnco29asY2v3TPbtF
@imlvts

imlvts commented Sep 17, 2026

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https://github.com/Adam-Vandervorst/PathMap/actions/runs/35158040227#summary-105053523842

Benchmark: +29.6% borrowed_head_write_creation_cleanup/10, and zipper_head_owned+10.5%

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