syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"ExprKind::ByUse"}]}
source_snippet:         ExprKind::ByUse { .. } => {
context_before:         ExprKind::Box { .. } => error(GenericConstantTooComplexSub::BoxNotSupported(node.span))?,
context_after:             error(GenericConstantTooComplexSub::ByUseNotSupported(node.span))?