syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":".map(|s|"}]}
source_snippet:                 .map(|s| s.to_string())
context_before:             src.get(start_index..end_index)
context_after:                 .ok_or(SpanSnippetError::IllFormedSpan(sp))