I'm trying to build a diacritic plugin which It's just a list of commands like

ia <leader>'e é " this one is source just fine
ia <leader>ae æ " This one causes error

But I'm seeing an error E474 when the file gets sourced.

I can't find a way to debug it, any help with this?

  • try the :scriptencoding command Commented Mar 28, 2023 at 6:01
  • I my tests the problem is not related to the æ character but to the <leader>ae sequence. If you try ia ae æ I believe it will work. I don't what are the lhs that are refused by ia. Commented Mar 28, 2023 at 7:37
  • 1
    @Ekiim, is the answer addressing your question or do you have some aspect that are not addressed. If the proposed solution address your question I would propose you to accept it using the v button next to the arrow voting buttons. It allow the question to rest :-) Commented Mar 30, 2023 at 14:21
  • 1
    It did help a lot, Thanks @VivianDeSmedt
    – ekiim
    Commented Apr 2, 2023 at 22:31
  • Thanks for the feedback :-) Commented Apr 3, 2023 at 5:09

1 Answer 1


Not every character sequences are acceptable for abbreviation (see: :h abbreviation).

To determine if a sequence is supported the last character is important.

If the last character is a non-keyword character (usually a letter, a number or an underscore) the sequence is supported (non-id sequence). Example are: #foo#, foo#, bar##

If the last character is a keyword character there are two types of sequence supported:

  1. The part before is only made of keyword characters (full-id sequence). Example are: foo, bar
  2. The part before is only made of non-keyword characters (end-id sequence). Example are: #a, #.#b

If the last character is a keyword you can't mix keyword and non-keyword on the first part. Example are: \ae

Remark: The definition of what is a keyword character can be configured using the iskeyword option (more information with :h 'iskeyword')

I could recommend you to either use the suffix approach:

ia e'\ é
ia ae\ æ

Or use the following answer that propose to check the character before the abbreviation and delete it before inserting the abbreviation.

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