I'm having some trouble with the embedded hal on a stm32f103...using the latest versions of the crates. Here's an example to create the issue.
```
#![allow(dead_code)]
pub struct Foo<PIN>
where PIN: embedded_hal::digital::InputPin
{
    pin: PIN
}

impl <PIN> Foo<PIN>
where PIN: embedded_hal::digital::InputPin
{
    pub fn new(pin: PIN) -> Self {
        Self { pin }
    }
}

#[cfg(test)]
mod test {
    use super::*;
    use stm32f1xx_hal::{pac, prelude::*, serial::{Config, Serial}};
    fn test_foo() {
        let dp = pac::Peripherals::take().unwrap();
        let mut gpiob = dp.GPIOB.split();
        let pin = gpiob.pb13.into_pull_up_input(&mut gpiob.crh);
        let mut foobar = Foo::new(pin);
    }
}

```
error[E0277]: the trait bound `stm32f1xx_hal::gpio::Pin<'B', 13, stm32f1xx_hal::gpio::Input<PullUp>>: InputPin` is not satisfied
  --> src\foo.rs:24:35
   |
24 |         let mut foobar = Foo::new(pin);
   |                          -------- ^^^ the trait `InputPin` is not implemented for `stm32f1xx_hal::gpio::Pin<'B', 13, stm32f1xx_hal::gpio::Input<PullUp>>`
   |                          |
   |                          required by a bound introduced by this call
   |
   = help: the trait `InputPin` is implemented for `&mut T`
note: required by a bound in `foo::Foo::<PIN>::new`
  --> src\foo.rs:9:12
   |
9  | where PIN: embedded_hal::digital::InputPin
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Foo::<PIN>::new`
10 | {
11 |     pub fn new(pin: PIN) -> Self {
   |            --- required by a bound in this associated function

error[E0277]: the trait bound `stm32f1xx_hal::gpio::Pin<'B', 13, stm32f1xx_hal::gpio::Input<PullUp>>: InputPin` is not satisfied
  --> src\foo.rs:24:26
   |
24 |         let mut foobar = Foo::new(pin);
   |                          ^^^^^^^^^^^^^ the trait `InputPin` is not implemented for `stm32f1xx_hal::gpio::Pin<'B', 13, stm32f1xx_hal::gpio::Input<PullUp>>`
   |
   = help: the trait `InputPin` is implemented for `&mut T`
note: required by a bound in `foo::Foo`
  --> src\foo.rs:3:12
   |
2  | pub struct Foo<PIN>
   |            --- required by a bound in this struct
3  | where PIN: embedded_hal::digital::InputPin
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Foo`

Some errors have detailed explanations: E0277, E0463.
For more information about an error, try `rustc --explain E0277`.
```
> cargo test