[cfg(feature = "abc")] doesn't seem to work with #program

[ferencdg]

feature abc is off

#[program]
pub mod dyn_staking {
    [cfg(feature = "abc")]
    pub fn modify_mock_clock(ctx: Context<MockClock>, mock_clock: u32) -> Result<()> {
        dyn_staking::instructions::modify_mock_clock(ctx, mock_clock)
    }
}

Error:

pub fn modify_mock_clock(ctx: Context, mock_clock: u32) -> Result<()> {
| ^^^^^^^^^^^^^^^^^ private function import