Bar line at beginning of piece

[ornello]

Is there any chance to start a piece with a "||" bar line?

I have tried this:

\version "2.12.2"
{
\time 4/4
\bar "||"
c''4
}

but it does not show the bar line (it works for "|:", however).

I have found the following hack:

\version "2.12.2"
{
\time 4/4
\grace s
\bar "||"
c''4
}

but this is not working for multiple staves.

Any ideas how to avoid the removal of the "||" bar line?
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