{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"///"}]}
    /// you should also probably have a `ParamEnv` from when it was built. If you don't,
    /// You should almost certainly not use this. If you already have an InferCtxt, then
    /// then you should take a `TypingEnv` to ensure that you handle opaque types correctly.