syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// no bound vars at all. (In other words, if this binder --
context_before:     /// Unwraps and returns the value within, but only if it contains
context_after:     /// and indeed any enclosing binder -- doesn't bind anything at