Repro of gophernotes + gonum/plot issue

badplot.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "ename": "ERROR",
     "evalue": "repl.go:26:7: cannot use <*gonum.org/v1/plot/plotter.BarChart> as <gonum.org/v1/plot.Plotter> in argument to p.Add",
     "output_type": "error",
     "traceback": [
      "repl.go:26:7: cannot use <*gonum.org/v1/plot/plotter.BarChart> as <gonum.org/v1/plot.Plotter> in argument to p.Add"
     ]
    }
   ],
   "source": [
    "import (\n",
    "     \"gonum.org/v1/plot\"\n",
    "     \"gonum.org/v1/plot/plotter\"\n",
    "     \"gonum.org/v1/plot/vg\"\n",
    "     \"image/color\"\n",
    "     \"log\"\n",
    ")\n",
    "groupA := plotter.Values{20, 35, 30, 35, 27}\n",
    "\n",
    "p, err := plot.New()\n",
    "if err != nil {\n",
    "     log.Panic(err)\n",
    "}\n",
    "p.Title.Text = \"Bar chart\"\n",
    "p.Y.Label.Text = \"Heights\"\n",
    "\n",
    "w := vg.Points(8)\n",
    "\n",
    "barsA, err := plotter.NewBarChart(groupA, w)\n",
    "if err != nil {\n",
    "     log.Panic(err)\n",
    "}\n",
    "barsA.Color = color.RGBA{R: 255, A: 255}\n",
    "barsA.Offset = -w / 2\n",
    "\n",
    "p.Add(barsA)\n",
    "p.Legend.Add(\"A\", barsA)\n",
    "err = p.Save(300, 250, \"barChart.png\")\n",
    "if err != nil {\n",
    "     log.Panic(err)\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Go",
   "language": "go",
   "name": "gophernotes"
  },
  "language_info": {
   "codemirror_mode": "",
   "file_extension": ".go",
   "mimetype": "",
   "name": "go",
   "nbconvert_exporter": "",
   "pygments_lexer": "",
   "version": "go1.13.8"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}