{"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"///"}]}
/// the mapping will map `'b` back to the GAT's `'b_identity`. Then we need to compress the
/// Given some where clause like `for<'b, 'c> <Self as Trait<'a_identity>>::Gat<'b>: Bound<'c>`,
/// remaining bound var `'c` to index 0.