syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // causing a cycle. So we just bail out in this case.
context_before:             // typeck (which type_of invokes below), will call back into opaque_types_defined_by
context_after:             if hir_sig.output.is_suggestable_infer_ty().is_some() {