syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// contain any bound vars that would be bound by the
context_before:     /// Wraps `value` in a binder, asserting that `value` does not
context_after:     /// binder. This is commonly used to 'inject' a value T into a