syntax_data: {"ast_node_type":"variable","tokens":[{"end":30,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut requires_storage =
context_before:     // Calculate the MIR locals that we need to keep storage around for.
context_after:         MaybeRequiresStorage::new(borrowed_locals_cursor1).iterate_to_fixpoint(tcx, body, None);