Initializers for properties with nullable types are analyzed with binding context common for all declarations.
This can cause invalid elements are left in the cache guarded with out-of-block modification tracker. This workaround forces increment for such cases.
1. Search the top-level function or property (only they can produce blocks that won't affect other declarations)
2. Check if current position is hidden by this declaration
O^2 behaviour is removed
Nikolay Krasko