syntax_data: {"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":"tcx:"}]}
source_snippet:     tcx: TyCtxt<'tcx>,
context_before: fn extend_cause_with_original_assoc_item_obligation<'tcx>(
context_after:     item: Option<&hir::Item<'tcx>>,