syntax_data: {"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"Ok(Err(ty))"}]}
source_snippet:             Ok(Err(ty)) => span_bug!(constant.span, "could not convert {ty:?} to a valtree"),
context_before:             Ok(Ok(valtree)) => Ok((valtree, ty)),
context_after:             Err(e) => Err(e),