{"ast_node_type":"other","tokens":[{"end":5,"kind":"keyword","start":0,"text":"{"}]}
    {
        M: Machine<'tcx, MemoryKind = crate::const_eval::MemoryKind, Provenance = CtfeProvenance>,
        let (alloc_id, offset, _) = self.ptr_get_alloc_id(ptr, 0)?;