syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// parameter. This is kind of a phantom type, except that the
context_before:     /// [`ty::ClosureArgs`] or [`ty::CoroutineClosureArgs`] using a type
context_after:     /// most convenient thing for us to are the integral types. This