make Destruct trait coinductive - #162399
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Makes
Destruct#[rustc_coinductive], and switches the goal source for the builtinDestructimpl conditions toImplWhereBound, which is required for coinduction to apply. This allows recursive types to beDestruct. Fixes #162217As a disclaimer, this is my first time contributing to the trait system so my knowledge of the internals is lacking and I may very well have taken the wrong approach/missed implications of the changes I made here. This code was hand-written without the assistance of an LLM.