syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"Ok(Ok(valtree))"}]}
source_snippet:             Ok(Ok(valtree)) => Ok((valtree, ty)),
context_before:         match self.tcx.const_eval_resolve_for_typeck(self.typing_env(), uv, constant.span) {
context_after:             Ok(Err(ty)) => span_bug!(constant.span, "could not convert {ty:?} to a valtree"),