{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"self.r.dcx().emit_err(errors::MacroUseNameAlreadyInUse"}]}
            self.r.dcx().emit_err(errors::MacroUseNameAlreadyInUse { span, name });
        if self.r.macro_use_prelude.insert(name, binding).is_some() && !allow_shadowing {
        }