Function nesting

packages/printer/src/internal/doc.ts:420–425

(react: (level: number) => Doc.Doc<A>)

/** @internal */
export const nesting = <A>(react: (level: number) => Doc.Doc<A>): Doc.Doc<A> => {
  const op = Object.create(proto)
  op._tag = "Nesting"
  op.react = react
  return op
}

/** @internal */
export const width = dual<