syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":".unwrap_or_else(|_|"}]}
source_snippet:                         .unwrap_or_else(|_| tcx.erase_regions(field_ty));
context_before:                         .try_normalize_erasing_regions(typing_env, field_ty)
context_after:                     f(variant, f_index.into(), field_ty);