Mhm sometimes I really doubt my sanity... Why does:
```
#[entry]
fn main() -> ! {
    let p = pac::Peripherals::take().unwrap();
    let rcc = p.RCC.constrain();

    let _clocks = rcc.cfgr.sysclk(SYSFREQ.Hz()).use_hse(25.MHz()).freeze();

    let gpioc = p.GPIOC.split();
    let mut led = gpioc.pc13.into_push_pull_output();

    loop {
        for _ in 0..100_000 {
            led.set_high();
        }
        for _ in 0..100_000 {
            led.set_low();
        }
    }
}
```
blink but when setting the led in the second for loop also to high the led does not light up at all? (board: black pill stm32f411)