syntax_data: {"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let ty = match tcx.try_normalize_erasing_regions(typing_env, ty) {
context_before:     // before typecheck has completed and uses `try_normalize_erasing_regions`.
context_after:         Ok(t) => t,