c1623a2ee7
Upgrade Chalk ~~Blocked on rust-lang/chalk#670~~ ~~Now blocked on rust-lang/chalk#680 and release~~ In addition to the straight upgrade, I also tried to fix some tests by properly returning variables and max universes in the solution. Unfortunately, this actually triggers the same perf problem that rustc traits code runs into in `canonicalizer`. Not sure what the root cause of this problem is, or why it's supposed to be solved in chalk. r? ```@nikomatsakis```
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