syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"tcx.dcx().emit_err(TestOutput"}]}
source_snippet:                 tcx.dcx().emit_err(TestOutput {
context_before:             if let Ok(demangling) = rustc_demangle::try_demangle(mangled.name) {
context_after:                     span: attr.span(),