syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // `ty_and_layout_field` erases regions in the returned type. We must
context_before:         // We cannot use `ty_and_layout_field` to retrieve the field type, since
context_after:         // not erase regions here, since we may need to ultimately emit outlives