syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // by looking up the projections associated with the def_id.
context_before:         // Grab the "TraitA + TraitB" from `impl TraitA + TraitB`,
context_after:         let bounds = tcx.explicit_item_bounds(def_id);