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This flag is calcualed in Namers, and assigned to class
and module class symbols that are defined in self/super-calls,
and in early definitions.
For example, class D is INCONSTRUCTOR in each case below:
class C extends Super({class D; ()})
class C(a: Any) {
def this(a: Any) = this({class D; ()})
}
new { val x = { class D; () } with Super(())
But, the calculation of this flag failed to account for
nesting, so it was not set in cases like:
class C(a: Any) {
def this(a: Any) = this({val x = {class D; ()}; x})
}
This patch searches the enclosing context chain, rather than
just the immediate context. The search is terminated at the
first non term-owned context. In the following example, this
avoids marking `E` as INCONSTRUCTOR; only `D` should be.
class C extends Super({class D { class E }; ()})
This closes SI-6259 and SI-6506, and fixes one problem
in the recently reopened SI-6957.
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