syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// only be called within `TypeFolder` methods, when a non-custom traversal
context_before:     /// Provides a default fold for a recursive type of interest. This should
context_after:     /// is desired for the value of the type of interest passed to that method.