syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // here at all since they're fully a MIR borrowck artifact, and we
context_before:         // As a side-note, we don't actually even care about fake borrows
context_after:         // don't need to borrowck by-move MIR bodies. But it's best to preserve