Try the following code:
echo "echomsg 42" > '$HOME'
vim -u NONE -i NONE -S '$HOME'
. It will show “E484: Can't open file /home/zyx”, while it should just echo 42.
Worse things will happen if file happens to contain pipe: as `-S …` is
translated to `so …` without escaping anything this will run some commands.
I think that instead `do_source` needs to be called directly on `-S`, with
another boolean value to disable expansion of anything.
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