{"ast_node_type":"other","tokens":[{"end":108,"kind":"keyword","start":0,"text":"//"}]}
                    // - Equate `?sig` with the unnormalized signature, e.g. `fn(<Foo<?x> as Trait>::Assoc)`
                    // - Create some new variable `?sig`
                    // - Depending on whether `<Foo<?x> as Trait>::Assoc` is rigid, ambiguous or normalizeable,