syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// For example, in `MyFolder::try_fold_ty(ty)`, it is valid to call
context_before:     /// is desired for the value of the type of interest passed to that method.
context_after:     /// `ty.try_super_fold_with(self)`, but any other folding should be done