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List: concat/flatten, init, find/find_opt, partition, mapi/iteri, assoc/assoc_opt. Option: iter/fold/to_list. Result: get_ok/get_error/ map_error/to_option. Fixed skip-to-boundary! in parser to track let..in / begin..end / struct..end / for/while..done nesting via a depth counter — without this, nested-let inside a top-level decl body trips over the decl-boundary detector. Stdlib functions like List.init / mapi / iteri use begin..end to make their nested-let intent explicit.