syntax_data: {"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"CanonicalVarKind::Ty(_)"}]}
source_snippet:             CanonicalVarKind::Ty(_) | CanonicalVarKind::Region(_) | CanonicalVarKind::Const(_) => {
context_before:         match self {
context_after:                 panic!("expected placeholder: {self:?}")