syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let guar = tcx.dcx().span_delayed_bug(
context_before:             if !tcx.check_args_compatible(leaf_def.item.def_id, args) {
context_after:                     tcx.def_span(leaf_def.item.def_id),