syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"|"}]}
source_snippet:             | CanonicalVarKind::Const(_)
context_before:             | CanonicalVarKind::PlaceholderTy(_)
context_after:             | CanonicalVarKind::PlaceholderConst(_) => false,