syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"CanonicalVarKind::PlaceholderTy(_)"}]}
source_snippet:             CanonicalVarKind::PlaceholderTy(_) => false,
context_before:             CanonicalVarKind::Ty(_) => true,
context_after:             CanonicalVarKind::Region(_) => true,