syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"tcx.mk_args_from_iter(args_a.iter().enumerate().map(|(i,"}]}
source_snippet:                     tcx.mk_args_from_iter(args_a.iter().enumerate().map(|(i, k)| {
context_before:                 let args =
context_after:                         if unsizing_params.contains(i as u32) { args_b[i] } else { k }