syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"(BoundConstness::Const,"}]}
source_snippet:             (BoundConstness::Const, BoundConstness::Const | BoundConstness::Maybe) => true,
context_before:         match (self, goal) {
context_after:             (BoundConstness::Maybe, BoundConstness::Maybe) => true,