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When a class captures an outer value, a field for that value is created
in the class. The class also gets a constructor parameter for the
captured value, the constructor will assign the field.
LambdaLift re-writes accesses to the local value (Ident trees) to the
field. However, if the statement accessing the local value will end up
inside the constructor, the access is re-written to the constructor
parameter instead. This is the case for constructor statements:
class C {
{
println(capturedLocal)
}
}
If C extends DelayedInit, the statement does not end up in C's
constructor, but into a new synthetic method. The access to
`capturedLocal` needs to be re-written to the field instead of the
constructor parameter.
LambdaLift takes the decision (field or constructor parameter) based on
the owner chain of `currentOwner`. For the constructor statement block,
the owner is a local dummy, for which `logicallyEnclosingMember` returns
the constructor symbol.
This commit introduces a special case in LambdaLift for local dummies
of DelayedInit subclasses: instead of the constructor, we use a
temporary symbol representing the synthetic method holding the
initializer statements.
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