syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"Some(\"nll\")"}]}
source_snippet:             Some("nll") => MirIncludeSpans::Nll,
context_before:             Some("off" | "no" | "n" | "false") => MirIncludeSpans::Off,
context_after:             _ => return false,