syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"Err(CodegenObligationError::Ambiguity"}]}
source_snippet:         Err(CodegenObligationError::Ambiguity | CodegenObligationError::Unimplemented) => {
context_before:         Ok(vtbl) => vtbl,
context_after:             return Ok(None);