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- Introduce `Symbol#packageObject` and `Type#packageObject`
to lookup the member package object of a package class/module,
and use this far and wide.
- Replace the overly complicated (and still buggy) implementation
of `Context#isInPackageObject` with a one liner. The simplifying
insight is that if we select a symbol from a package prefix
that does not own that symbol, it *must* have really been
selected from the package object.
- Change implicit search to use the cache in
`ModuleSymbol#implicitMembers` via `Type#implicitMembers`,
which lets the client code read more naturally.
Fixes a bug with `adapt::insertApply` that Adriaan spotted in a feat
of lateral thinking. This is tested in t8862b.scala. alladin763.scala
adds the test case from the bug originally remedied by `insertApply`
to check we haven't regressed.
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