Backport "Check user defined PolyFunction refinements " to LTS #20647
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`PolyFunction` must be refined with an `apply` method that has a single parameter list with no by-name nor varargs parameters. It may optionally have type parameters. Some of these restrictions could be lifted later, but for now these features are not properly handled by the compiler. Fixes #8299 Fixes #18302 [Cherry-picked e5ca0c4][modified]
[Cherry-picked 9966ced]
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No regressions detected in the community build up to lts-18731. |
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Backports #18457 to the LTS branch.
PR submitted by the release tooling.
[skip ci]