markdown-edit-code-block errors with (void-function nil)

[blaenk]

Expected Behavior

For an edit-indirect buffer to open with the contents of the codeblock.

Actual Behavior

The following backtrace.

Steps to Reproduce

Buffer like this with cursor in the middle of the codeblock:

``` ini
[/Script/EngineSettings.GameMapsSettings]
+GameModeMapPrefixes=(Name="DM",GameMode="/Script/UnrealTournament.UTDMGameMode")
+GameModeClassAliases=(Name="DM",GameMode="/Script/UnrealTournament.UTDMGameMode")
```

This only seems to happen for languages that don't have obvious mappings between codeblock language marker and emacs mode, so I wonder if it's related to the changes made for #251 , something about this comment #251 (comment) or the one after it. Sorry it's been a while since I wrote that.

Backtrace

Debugger entered--Lisp error: (void-function nil)
  nil()
  #f(compiled-function (parent-buffer beg end) #<bytecode>)(#<buffer asdf> 11 218)
  edit-indirect--create-indirect-buffer(11 218 #<overlay from 11 to 218 in asdf>)
  edit-indirect--get-edit-indirect-buffer(11 218)
  edit-indirect-region(11 218 display-buffer)
  markdown-edit-code-block()
  funcall-interactively(markdown-edit-code-block)
  call-interactively(markdown-edit-code-block nil nil)
  command-execute(markdown-edit-code-block)

Software Versions

• Markdown Mode: 2.4-dev
• Emacs: 26.0.50
• OS: archlinux 4.13.12-1-ARCH

[blaenk]

Please see 3b92618#commitcomment-25598489 , I think it may be the cause of this issue.

[jrblevin]

Thanks for following up on this aspect. I forgot to address in from previous comments, but I think it is fixed now.

[blaenk]

It appears to be working 👍