syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// - Inside of the body of `foo`, we treat `T` as a placeholder by calling
context_before:     /// - Outside of `foo`, `T` is bound (represented by the presence of `EarlyBinder`).
context_after:     /// `instantiate_identity` to discharge the `EarlyBinder`.