syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"#[cfg_attr(not(test),"}]}
source_snippet:     #[cfg_attr(not(test), rustc_diagnostic_item = "SpanCtxt")]
context_before:     /// It's a cut-down version of `data_untracked`.
context_after:     #[inline]