Abdulhaq:
Ah! Great, doing the full import fixed it. The interface precedes the implementation in the same file, so it seems to me it's possibly a subtle glitch in the compiler with selective imports (the change I was making was in another module where I was subclassing Klass, which was the class with the array on it).
Please create a reduced example that shows the problem, to be put in Bugzilla.
Bye, bearophile
