syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // the end of the list corresponding to the opaque's generics.
context_before:                     // the GAT. Since RPITITs also have all of the fn's generics, we slice only
context_after:                     for param in &generics.own_params[tcx.generics_of(fn_def_id).own_params.len()..]