syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Some(mut mspans) = self.0.try_write() {
context_before:     pub fn get(&self, span: Span) -> Option<Span> {
context_after:             if let Some((var_span, read)) = mspans.get_mut(&span) {