syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // is constrained to an insufficient type later on.
context_before:         // then additionally register an `AsyncFnKindHelper` goal which will fail if the kind
context_after:         if let Some(closure_kind) = self.infcx.shallow_resolve(kind_ty).to_opt_closure_kind() {