syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // If we find a `Self: Sized` bound on the item, then we know
context_before:                 let sized_def_id = tcx.lang_items().sized_trait();
context_after:                 // that `dyn Trait` can certainly never apply here.