Converting between Contexts

[axos88]

Having a

  struct Context {
    a: u32,
    b: bool,
    c: String
  }

  struct SubContext1 {
    a: u32,
    b: bool
  }

  struct SubContext2 {
    a: u32,
    c: String
  }

How can the FromContext implementations be written? Seems like they take and return a reference, and there doesn't seem to be a way to satisfy the borrow checker.

Maybe FromContext should take, or have the ability to take a [clonable] context and produce an owned value?

[axos88]

Something like:

pub trait FromContext<'a, T> {
    fn from(v: &'a T) -> Self;
}

with a default implementation of

impl<'a, T> FromContext<'a, T> for &'a T {
    fn from(v: &'a T) -> Self {
        v
    }
}

perhaps?