syntax_data: {"ast_node_type":"other","tokens":[{"end":7,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     ///
context_before:     /// This is used to find the span of the macro call when a parent expr span, i.e. `outer`, is known.
context_after:     /// [`find_ancestor_inside_same_ctxt`]: Self::find_ancestor_inside_same_ctxt