syntax_data: {"ast_node_type":"function","tokens":[{"end":69,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn freeze_and_get_read_spans(&self) -> UnordMap<Span, Span> {
context_before:     /// After this is frozen, no spans that have not been read can be read.
context_after:         self.0.freeze().items().filter(|(_, (_, b))| *b).map(|(s1, (s2, _))| (*s1, *s2)).collect()