A question about rust generics.

RustQuestion2

/*
I want a 'MyStruct' that can take any of the floating point primitive types.
When instantiating a 'MyStruct', I want to do so with MyStruct::new(val),
which should create a struct with val: val, but should also initialise
a: 0.0(f32/f64 - whatever it's floating point type is) and
b: 1.0(f32/f64 - whatever it's floating point type is).

Can I do this with a single impl method (like below)? Am I on the right
track, or is there a better way to handle this situation in Rust? (I'm
coming from c++).
*/

pub struct MyStruct<T> {
  pub val: T,
  a: T,
  b: T
}

impl<T: Float> MyStruct<T> {
  pub fn new(val: T) -> MyStruct<T> {
    MyStruct{
      val: val,
      a: 0.0, // Error: mismatched types: expected `T` but found `<generic float#0>`
      b: 1.0  // Error: mismatched types: expected `T` but found `<generic float#1>`
    }
  }
}

It turns out that one should use:
std::num::One::one() or std::num::Zero::zero() rather than primitives, as they are not automatically cast to the template's floating point type as in c / c++.