syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":".unwrap_or_else(|_|"}]}
source_snippet:                     .unwrap_or_else(|_| tcx.erase_regions(query_ty));
context_before:                     .try_normalize_erasing_regions(typing_env, query_ty)