syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":".unwrap_or_else(||"}]}
source_snippet:             .unwrap_or_else(|| bug!("`expect_boxed_ty` is called on non-box type {:?}", self))
context_before:         self.boxed_ty()
context_after:     }