Understanding automatic vimrc sourcing

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Hello,

* What I want:

Be able to do :w after editing $MYVIRC and have vim source the new
version of config. Basically, just execute `source %` automatically.

* What I have tried (all examples are launched with `vim -u testvimrc`):

So, this works without any error, as supposed:
> set nocompatible
> filetype plugin indent on
> syntax on
>
> augroup vimrc
> autocmd!
> autocmd BufWritePost testvimrc source testvimrc | echom "Reloaded"
> augroup END

However, if I try wrapping it in a function, E127 occurs:
> set nocompatible
> filetype plugin indent on
> syntax on
>
> augroup vimrc
> autocmd!
> autocmd BufWritePost testvimrc call s:ReloadRC("testvimrc")
> augroup END
>
> function! s:ReloadRC(rc)
> exec 'source ' . a:rc | echom "Reloaded " . a:rc
> endfunction

Whenever I do :w, I see:
> E127: Cannot redefine function <SNR>1_ReloadRC: It is in use

But at the same time it doesn't abort and I see:
> Reloaded testvimrc
, so it looks like the new vimrc gets sourced regardless?..

* My questions:
1) Why doesn't this work if wrapped into a function, but does, if
written out directly?
2) Why, if an error occurs, I still see "Reloaded testvimrc"?
3) Does it have anything to do with reentrancy?
4) Is it possible to make it work through calling a function (since I
would want to do the same for gvimrc (as well as vimrc), and don't want
to have repetitive code, instead using a reusable function code)?

Thank you in advance.
--
Regards,
Oleksii Vilchanskyi
PGP:0x8D3A0E046BDE941F2A53867CE3FD952D48C0B338

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