ZyX wrote:
> Attached script, being sourced causes vim to hang up forever.
> Test command:
> vim -u NONE -c 'so bug.vim'
To clarify the problem, start Vim 7.3.3 and enter the following
(this is the essence of the script mentioned above, and will
cause Vim to hang, so close all files first):
:let l=[]
:call add(l, l)
:let dict4={"l": l}
:call add(dict4.l, dict4)
:echo (dict4 ==# deepcopy(dict4))
The last line causes Vim to hang (CPU goes to 100%, memory is
not consumed).
Starting an investigation:
:let l=[]
:call add(l, l)
:echo 'l=' l
:let k=[]
:call add(k, deepcopy(k))
:echo 'k=' k
The above displays:
l= [[...]]
k= [[]]
I do not know what the "..." means but it is probably a bad
sign. Further investigation confirms this:
:redir @a
:let exp = 'l'
:for i in range(1, 10)
: execute 'let val = ' . exp
: echo exp '=' val
: unlet val
: let exp .= '[0]'
:endfor
:redir END
:$put a
---Output---
l = [[...]]
l[0] = [[...]]
l[0][0] = [[...]]
l[0][0][0] = [[...]]
l[0][0][0][0] = [[...]]
l[0][0][0][0][0] = [[...]]
l[0][0][0][0][0][0] = [[...]]
l[0][0][0][0][0][0][0] = [[...]]
l[0][0][0][0][0][0][0][0] = [[...]]
l[0][0][0][0][0][0][0][0][0] = [[...]]
Also, the output from:
:echo string(l)
is
E724: variable nested too deep for displaying
John
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