syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"CanonicalVarKind::Const(_)"}]}
source_snippet:             CanonicalVarKind::Const(_) => true,
context_before:             CanonicalVarKind::PlaceholderRegion(..) => false,
context_after:             CanonicalVarKind::PlaceholderConst(_) => false,