syntax_data: {"ast_node_type":"variable","tokens":[{"end":50,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut cx = ThirBuildCx::new(tcx, owner_def);
context_before:     let body = tcx.hir_body_owned_by(owner_def);
context_after:     if let Some(reported) = cx.typeck_results.tainted_by_errors {