syntax_data: {"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"(BoundConstness::Maybe,"}]}
source_snippet:             (BoundConstness::Maybe, BoundConstness::Maybe) => true,
context_before:             (BoundConstness::Const, BoundConstness::Const | BoundConstness::Maybe) => true,
context_after:             (BoundConstness::Maybe, BoundConstness::Const) => false,