syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"ty::ConstKind::Infer(ty::InferConst::Var(b_vid)),"}]}
source_snippet:             ty::ConstKind::Infer(ty::InferConst::Var(b_vid)),
context_before:             ty::ConstKind::Infer(ty::InferConst::Var(a_vid)),
context_after:         ) => {