syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"|(parent_field_idx,"}]}
source_snippet:         |(parent_field_idx, parent_capture), (child_field_idx, child_capture)| {
context_before:         tcx.closure_captures(coroutine_def_id).iter().skip(num_args).copied(),
context_after:             // Store this set of additional projections (fields and derefs).