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When typechecking the primary constructor body, the symbols of
constructor parameters of a class are owned by the class's owner.
This is done make scoping work; you shouldn't be able to refer to
class members in that position.
However, other parts of the compiler weren't so happy about
this arrangement. The enclosed test case shows that our
checks for invalid, top-level implicits was spuriously triggered,
and implicit search itself would fail.
Furthermore, we had to hack `Run#compiles` to special case
top-level early-initialized symbols. See SI-7264 / 86e6e9290.
This commit:
- introduces an intermediate local dummy term symbol which
will act as the owner for constructor parameters and early
initialized members
- adds this to the `Run#symSource` map if it is top level
- simplifies `Run#compiles` accordingly
- tests this all in a top-level class, and one nested in
another class.
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