syntax_data: {"ast_node_type":"function","tokens":[{"end":64,"kind":"keyword","start":0,"text":"pub(crate)"}]}
source_snippet:     pub(crate) fn source_info(&self, span: Span) -> SourceInfo {
context_before:     /// Given a span and the current source scope, make a SourceInfo.
context_after:         SourceInfo { span, scope: self.source_scope }