syntax_data: {"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let hir::Node::Field(field) = tcx.hir_node_by_def_id(field_id) else {
context_before:         // Find the span(s) that contain the next item in the cycle
context_after:             bug!("expected field")