Function run 

pub fn run<'w, P: Copy, S>(
    x: &mut impl SqlHost<'w, P, S>,
    entry: &SqlEntry<P, S>,
    sqlca: &Sqlca<P>,
    pos: Pos,
) -> Result<Option<Ran>, Abend>

Runs a statement and fills the SQLCA; None for a declaration, which does nothing.