Hello everyone,

I'm experiencing a problem with a self-written Lua-filter after upgrading 
to 2.15.

The filter ran (and still runs) fine with older versions of pandoc, but 
with 2.15 I get the following error:

PandocLuaError "Error during function call:\n\tstring expected, got 
string\n\twhile retrieving function argument string\n\twhile retrieving 
arguments for function Str\nstack traceback:\n\t[C]: in field 
'Str'\n\tscripts/klausur.lua:11: in function 
<scripts/klausur.lua:9>\n\t[C]: in ?\n\t[C]: in field 
'walk_block'\n\tscripts/klausur.lua:8: in function 'processheader'"

stack traceback:

[C]: in field 'walk_block'

scripts/klausur.lua:8: in function 'processheader'
The corresponding Lua code looks like this (I hope the formatting is 
preserved):

 7 function processheader(elem)
 8     return pandoc.walk_block(elem, {
 9         Str = function(elem)
10             if string.match(elem.text, "%%%d+p%%") ~= nil then
11                 return pandoc.Str()
12             end
13         end
14     })
15 end

I'd be thankful for any suggestion what is going wrong here.

Kind regards,
Philipp


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