{"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"let"}]}
    let tainted_by_errors = if !tcx.is_synthetic_mir(def) {
    // We only need to borrowck non-synthetic MIR.
        tcx.mir_borrowck(tcx.typeck_root_def_id(def.to_def_id()).expect_local()).err()