syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"std::any::type_name::<R>(),"}]}
source_snippet:         std::any::type_name::<R>(),
context_before:         "structurally_relate_consts::<{}>(a = {:?}, b = {:?})",
context_after:         a,