syntax_data: {"ast_node_type":"variable","tokens":[{"end":36,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let used = matches!(
context_before:             BlockSafety::ExplicitUnsafe(hir_id) => {
context_after:                     self.tcx.lint_level_at_node(UNUSED_UNSAFE, hir_id).level,