syntax_data: {"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let contents = self.tcx.destructure_const(ct);
context_before:             ty::Array(..) | ty::Tuple(..) | ty::Adt(..) | ty::Slice(_) => {
context_after:                 let fields = contents.fields.iter().copied();