syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // don't need to borrowck by-move MIR bodies. But it's best to preserve
context_before:         // here at all since they're fully a MIR borrowck artifact, and we
context_after:         // as much as we can between these two bodies :)