syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"ArgumentSorts(ExpectedFound<I::Ty>,"}]}
source_snippet:     ArgumentSorts(ExpectedFound<I::Ty>, usize),
context_before:     Sorts(ExpectedFound<I::Ty>),
context_after:     Traits(ExpectedFound<I::DefId>),