syntax_data: {"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// if an error occurred while retrieving the code snippet.
context_before:     /// Extends the given `Span` to just before the previous occurrence of `c`. Return the same span
context_after:     pub fn span_extend_to_prev_char_before(