syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":".ok_or_else(||"}]}
source_snippet:                                             .ok_or_else(|| error(cx, LayoutError::Unknown(ty)))?,
context_before:                                             .try_to_bits(tcx, cx.typing_env)
context_after:                                         extract_const_value(cx, ty, end)