Code example on https://pandoc.org/lua-filters.html#pandoc.simpletable appears to be wrong

[odkr]

Description

There is a code example for using pandoc.SimpleTable on https://pandoc.org/lua-filters.html#pandoc.simpletable.

It reads:

local caption = "Overview"
local aligns = {pandoc.AlignDefault, pandoc.AlignDefault}
local widths = {0, 0} -- let pandoc determine col widths
local headers = {"Language", "Typing"}
local rows = {
  {{pandoc.Plain "Haskell"}, {pandoc.Plain "static"}},
  {{pandoc.Plain "Lua"}, {pandoc.Plain "Dynamic"}},
}
simple_table = pandoc.SimpleTable(
  caption,
  aligns,
  widths,
  headers,
  rows
)

However, this code throws error when run with Pandoc v2.11.0.4 on macOS v10.14.6.

Steps to reproduce

1. Wrap the above code in a filter and save it as filter.lua

   function CodeBlock ()
       local caption = "Overview"
       local aligns = {pandoc.AlignDefault, pandoc.AlignDefault}
       local widths = {0, 0} -- let pandoc determine col widths
       local headers = {"Language", "Typing"}
       local rows = {
           {{pandoc.Plain "Haskell"}, {pandoc.Plain "static"}},
           {{pandoc.Plain "Lua"}, {pandoc.Plain "Dynamic"}},
       }
       simple_table = pandoc.SimpleTable(
           caption,
           aligns,
           widths,
           headers,
           rows
       )
       return pandoc.utils.from_simple_table(simple_table)
   end

2. Call the filter with a document that runs it.

   pandoc -L filter.lua <<'EOF'
   > ```
   > ```
   > EOF

This throws:

Error running filter filter.lua:
PandocLuaError "Error during function call: Could not get SimpleTable: Could not read list: expected table, got 'Language' (string)"
stack traceback:
[C]: in function 'pandoc.utils.from_simple_table'
filter.lua:17: in function 'CodeBlock'

Getting the code to work

I got the code to work by changing

local headers = {"Language", "Typing"}

to

local headers = {{pandoc.Para({pandoc.Str "Language"})}, {pandoc.Para({pandoc.Str "Typing"})}}