To reproduce:
vim -u NONE -i NONE
:let x = getreg("a",1,1)
:call setreg("0",x)
gives SIGSEGV on master vim (huge build). "-i NONE" is needed to make sure
registers are undefined.
it seems like getreg returns a NULL list (I don't know if that is supposed to
be a thing) for an undefined register, but setreg doesn't handle it.
Maybe the NULL list is meant to behave like a locked empty list, but then
:call add(x, something)
should be an error right? Right now it apparently succeeds but len(x) is still
0.
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