Type bound regression

[DGolubets]

This example doesn't work on master (but it did in 0.5.1):

struct X<T: Debug>(T);

#[automock]
trait Foo {
    fn foo<T: Debug + 'static>(&self, x: X<T>);
}

Gives an error:

`T` cannot be formatted using `{:?}` because it doesn't implement `std::fmt::Debug`

However if I move type bounds to where it works:

#[automock]
trait Foo {
    fn foo<T>(&self, x: X<T>)
        where T: Debug + 'static;
}

[asomers]

The bug was introduced by b2d762e