syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// path; we would also emit a free on the 'success' path from
context_before:     /// We would allocate the box but then free it on the unwinding
context_after:     /// panic, but that will turn out to be removed as dead-code.