syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Applies to traits with the `rustc_specialization_trait` attribute.
context_before:     /// `X<'x>: T<'y>` for any lifetimes, then `for<'a, 'b> X<'a>: T<'b>`.
context_after:     AlwaysApplicable,