syntax_data: {"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut symbol_names = SymbolNamesTest { tcx };
context_before:     tcx.dep_graph.with_ignore(|| {
context_after:         let crate_items = tcx.hir_crate_items(());