syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"Err(if"}]}
source_snippet:         Err(if a_is_callsite { b_orig } else { a_orig })
context_before:         let a_is_callsite = a.ctxt.is_root() || a.ctxt == b.span().source_callsite().ctxt();
context_after:     }