Compiler warning for where clause

[xd009642]

My where clauses in traits recently had some unnecessary noise that the compiler could warn against:

What I was doing:

impl<T> SomeTrait<T> where T: Clone, T: Debug

What I should have been doing:

impl<T> SomeTrait<T> where T: Clone + Debug

I'd be happy to implement this myself if there's a consensus on adding this as a warning, though I may need some mentoring 👍

[estebank]

These probably make more sense as clippy lints.

[xd009642]

That makes sense, I've raised an issue on clippy as well rust-lang/rust-clippy#3764.

[Centril]

Closing in favor of the clippy issue.