I'm trying to debug an error in a vim plugin. The only clue I'm getting regarding the location of the error is this message:

Error detected while processing function 190[2]..191[15]..218:
line   27:
<custom error message>

I've tried Googling an answer to this question, but it hasn't turned up anything. I know that:

  • [2], [15], and 27 are line number offsets from the function definition, and
  • 190, 191, and 218 point to functions.

I don't need help debugging the script, but I'd like to know how to find the names of these functions? Is there a built-in Vim function to reveal the functions' number/name association?

2 Answers 2


I use fnum to represent function number in this answer.

Get numbered function definition

:function {fnum}

It's documented at :h numbered-function

Add breakpoint to numbered-function

:breakadd func lnum fnum

Note that everytime you sourced a numbered function, a new numbered function is created.

Add breakpoint to numbered-function without knowing the number

It's the same job as get number of numbered-function from definition, it's dirty and crude, you properbally don't want to do it.

You can loop function number from 1 to a max number and compare result of function {fnum} and your current numbered function. There will be multiple results if numbered function is sourced multiple times.

Set breakpoint to all numberd-funcitons

:breakadd func lnum [0-9]\\\{1,\}

:h :debug-name use the same pattern with autocommand, it's documented at :h file-pattern .


:verbose function {fnum} will also tell you where the function is defined (Thanks to Phi R).

  • 1
    Tpope’s scriptease is also good for this, providing a souped up Breakadd as well as other goodies
    – D. Ben Knoble
    Jun 11, 2019 at 0:45
  • @D.BenKnoble It doesn't support numbered function.
    – dedowsdi
    Jun 11, 2019 at 1:13
  • This is exactly what I was looking for. Thanks!
    – Phil R
    Jun 11, 2019 at 15:02
  • 1
    While it doesn't give you the name of the function, :verbose function {42} will show you where the function is defined.
    – Phil R
    Jun 11, 2019 at 15:09
  • @PhilR That's something i'm looking for, thanks.
    – dedowsdi
    Jun 11, 2019 at 23:03

If you are profiling when the function is called, vim will print the lines of the function to a log file.

:profile foo.log
:profile func *

{do whatever causes the error}

:profile pause
:noautocmd qall!

Now, inspect foo.log for lines like /FUNCTION\s\+190(/. The location (script/linenumber) where the function is defined will be printed.

  • Thanks for the suggestion; however, I should've mentioned my error is thrown by an VimEnter autocommand, so I couldn't get profiling to work.
    – Phil R
    Jun 11, 2019 at 15:01

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