Vimscript - Invalid argument in function declaration

Question

I'm learning some Vimscript code from here .

And the next lines will not compile:

function! Mapped(fn ,l)
     let new_list = deepcopy(a:l)
     call map(new_list, string(a:fn) . '(v:val)')
     return new_list
endfunction

When I'm running :source %

I'm getting the following error:

Invalid argument: Mapped(fn, l)

I cant' seem to figure out how.

Yes I'm trying to call this function from command mode and it is resulting in "Unknown function " — Shikloshi, Commented Jun 25, 2016 at 17:25
You should remove the space between the argument fn and the comma: function! Mapped(fn, l). — user9433424, Commented Jun 25, 2016 at 17:28
The space before comma is not accepted. This looks like a bug in the parser, report it to vim_dev. — Sato Katsura, Commented Jun 25, 2016 at 18:05
@SatoKatsura It's a known problem and mentioned in the help (:h todo (search for function, I even posted a patch about it, but Bram didn't want to included it, since he didn't like the style — Christian Brabandt, Commented Jun 26, 2016 at 19:38

J. Chomel · Accepted Answer · 2016-06-28 06:22:17Z

2

Because of a bug in vim_dev parser, the space before coma is not accepted.

Thus you must use:

function! Mapped(fn,l)
     let new_list = deepcopy(a:l)
     call map(new_list, string(a:fn) . '(v:val)')
     return new_list
endfunction

answered Jun 28, 2016 at 6:22

J. Chomel

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