在 Julia 中将程序的文档字符串打印到标准输出

Print a docstring of a program to stdout in Julia

Julia 在命令行上接受 ?sin 以显示帮助文本。我相信这样的帮助文本是作为文档字符串实现的。我想在运行时从我的 Julia 程序中打印此类文档字符串。怎么做?

julia> @doc sin
  sin(x)

  Compute sine of x, where x is in radians.

  sin(A::AbstractMatrix)

  Compute the matrix sine of a square matrix A.

  If A is symmetric or Hermitian, its eigendecomposition (eigen) is used to compute the
  sine. Otherwise, the sine is determined by calling exp.

  Examples
  ≡≡≡≡≡≡≡≡≡≡

  julia> sin(fill(1.0, (2,2)))
  2×2 Matrix{Float64}:
   0.454649  0.454649
   0.454649  0.454649