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cf5068bd62
Implement some candidates for the new solver (redux)
Based on #106718, so the diff is hard to read without it. See [here](98700cf481...compiler-errors:rust:new-solver-new-candidates-2) for an easier view until that one lands.
Of note:
* 44af916020fb43c12070125c45b6dee4ec303bbc fixes a bug where we need to make the query response *inside* of a probe, or else we make no inference progress (I think)
* 50daad5acd2f163d03e7ffab942534f09bc36e2e implements `consider_assumption` for traits and predicates. I'm not sure if using `sup` here is necessary or if `eq` is fine.
* We decided that all of the `instantiate_constituent_tys_for_*` functions are verbose but ok, since they need to be exhaustive and the logic between each of them is not similar enough, right?
r? ``@lcnr``
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