syntax_data: {"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let args = tcx.erase_regions(rcvr_args);
context_before:                     // Use the default `fn clone_from` from `trait Clone`.
context_after:                     Some(ty::Instance::new_raw(trait_item_id, args))