{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
    /// compares lifetimes directly, so we need to map the inference variables
    /// type of `_Return<'_x>`. `infer_opaque_definition_from_instantiation`
    /// back to concrete lifetimes: `'static`, `ReEarlyParam` or `ReLateParam`.