Update primary constructor proposal based on email thread #4161
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This PR updates the primary constructor feature specification based on recent ideas in an email thread. In particular, it introduces support for an initializer list in a primary constructor in the header of the enclosing declaration (of a class or an enum), and allows parameters to be declared without introducing an instance variable iff they are used for another purpose (such as
this.v = xorsuper.name(x)).I haven't reintroduced the in-body primary constructors (but we can easily do that, if requested).
As we've done on some earlier occasions, I'll land this document now (it is 'working'). The language team can then discuss it and adjust it as needed in further PRs.