syntax_data: {"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Ok(snippet) = self.span_to_snippet(sp)
context_before:     pub fn span_through_char(&self, sp: Span, c: char) -> Span {
context_after:             && let Some(offset) = snippet.find(c)