syntax_data: {"ast_node_type":"other","tokens":[{"end":101,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // case, since it has been liberated), map it back to the early-bound lifetime of
context_before:                     // For each captured opaque lifetime, if it's late-bound (`ReLateParam` in this
context_after:                     // the GAT. Since RPITITs also have all of the fn's generics, we slice only