syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"&ExprKind::Unary"}]}
source_snippet:         &ExprKind::Unary { op, arg } if check_unop(op) => {
context_before:         }
context_after:             let arg_ty = body.exprs[arg].ty;