syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:                     for param in &generics.own_params[tcx.generics_of(fn_def_id).own_params.len()..]
context_before:                     // the end of the list corresponding to the opaque's generics.
context_after:                     {