syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // generic args, instead of how we represent them in body expressions.
context_before:         // FIXME(mgca): we will need to special case IACs here to have type system compatible
context_after:         let c = ty::Const::new_unevaluated(self.tcx, ty::UnevaluatedConst { def: def_id, args });