syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"InferConst::Var(var)"}]}
source_snippet:             InferConst::Var(var) => write!(f, "{var:?}"),
context_before:         match self {
context_after:             InferConst::Fresh(var) => write!(f, "Fresh({var:?})"),