Backport "Refine implicit search fallbacks for better ClassTag handling" to 3.3 LTS #518
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It's not necessary to instantiate all type variables, deeply, since we are only interested in the outermost shape. Also, that way we do not instantiate to Nothing, which is something difficult to recover from. [Cherry-picked e6bf7b8]
We used to look at deep expected type when the result of an implicit was ambiguous. This could add more constraints which could resolve the ambiguity. We now do the same also if the search type has uninstantiated type variables. In that case, consulting more context might further constrain type variables, which might in turn enlarge the implicit scope so that a solution can be found. Fixes scala#23526 [Cherry-picked 45f7ef6]
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Backports scala#23532 to the 3.3.7.
PR submitted by the release tooling.
[skip ci]