syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"cx.typing_env,"}]}
source_snippet:                                 cx.typing_env,
context_before:                             match tcx.try_normalize_erasing_regions(
context_after:                                 tcx.struct_tail_raw(pointee, |ty| ty, || {}),