syntax_data: {"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"ExprKind::RawBorrow"}]}
source_snippet:         ExprKind::RawBorrow { .. } | ExprKind::Deref { .. } => maybe_supported_error(
context_before:         // FIXME(generic_const_exprs): We may want to support these.
context_after:             GenericConstantTooComplexSub::AddressAndDerefNotSupported(node.span),