method NonLeafBlockBuilder.prototype.concatRe-exportimport { NonLeafBlockBuilder } from "https://deno.land/x/rimbu@0.14.1/list/custom/index.ts"; concat(other: NonLeafBlockBuilder<T, C>, prependOther?): voidParametersother: NonLeafBlockBuilder<T, C>optionalprependOther = [UNSUPPORTED]Returnsvoid