syntax_data: {"ast_node_type":"function","tokens":[{"end":73,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn new(source_map: &'sm SourceMap) -> CachingSourceMapView<'sm> {
context_before: impl<'sm> CachingSourceMapView<'sm> {
context_after:         let files = source_map.files();