syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"tcx.item_name(assoc_def_id),"}]}
source_snippet:             tcx.item_name(assoc_def_id),
context_before:             "No associated type `{}` for {}",
context_after:             tcx.def_path_str(impl_def_id)