Vim9: Not able to define a legacy script-local function inside a def function

[Yegappan Lakshmanan]

Hi,

Inside a Vim9 def function, I am not able to create a legacy
script-local function
using the "s:" prefix. Example:

----------------------------------------------------------------------------------------
vim9script

def T()
func s:F1()
endfunc
var Fn: func = s:F1
enddef
defcompile

func s:F2()
endfunc

var Fn: func = s:F2
----------------------------------------------------------------------------------------

When I source the above script, I get the "E1075: Namespace not
supported: s:F1()"
error message.

I am able to define a script-local function using the "s:' prefix at the script
level though.

- Yegappan

[Yegappan Lakshmanan]

The same issue applies to Vim9 def function also:

----------------------------------------------------------------------------------------
vim9script

def T()
def s:F1()
enddef

var Fn: func = s:F1
enddef
defcompile

def s:F2()
enddef

var Fn: func = s:F2
----------------------------------------------------------------------------------------

If I source the above script, I get the "E1075: Namespace not supported: s:F1()"
error message. But at the script level, there is no error.

- Yegappan

[Bram Moolenaar]

The basic idea is that script-local functions are defined at the script
level. And not created or deleted dynamically.

The main reason is that in a compiled :def function these script
functions can be called by index, instead of having to look them up by
name (and handle failure). That is more efficient and allows for type
checking of arguments and return value.

Currently this function lookup by index only happens for :def functions,
but it could also be done for legacy functions. Applying the same rule
for both type of functions is more consistent anyway.

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