Remove superfluous blanket impls in our logging traits #8605
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Our core logging traits have to be object-safe, which means
Self
must be unsized, which means all methods must take either a shared or exclusive reference.This in turns means that any
impl Trait for &something
is non-sensical, since this lowers toimpl Trait for &&self
, which just gives extra work to the compiler for no reason since this is semantically identical to the builtin autoderef magic.