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test/let_spec: self-referencing List. (#6228)

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Regression test coverage for #6070.
This commit is contained in:
Justin M. Keyes 2017-03-08 03:23:40 +01:00 committed by GitHub
parent 58b5e14387
commit 087acd79f8
1 changed files with 23 additions and 0 deletions
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23
test/functional/eval/let_spec.lua
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@ -4,6 +4,7 @@ local eq = helpers.eq
local clear = helpers.clear
local meths = helpers.meths
local redir_exec = helpers.redir_exec
local source = helpers.source
before_each(clear)
@ -19,4 +20,26 @@ describe(':let command', function()
eq('\ng:["v"][0] #0', redir_exec('let g:["v"][0]'))
eq('\n{"g:"}["v"][0] #0', redir_exec('let {"g:"}["v"][0]'))
end)
it(":unlet self-referencing node in a List graph #6070", function()
-- :unlet-ing a self-referencing List must not allow GC on indirectly
-- referenced in-scope Lists. Before #6070 this caused use-after-free.
source([=[
let [l1, l2] = [[], []]
echo 'l1:' . id(l1)
echo 'l2:' . id(l2)
echo ''
let [l3, l4] = [[], []]
call add(l4, l4)
call add(l4, l3)
call add(l3, 1)
call add(l2, l2)
call add(l2, l1)
call add(l1, 1)
unlet l2
unlet l4
call garbagecollect(1)
call feedkeys(":\e:echo l1 l3\n:echo 42\n:cq\n", "t")
]=])
end)
end)