exportNamesNotDeclared method
Own top-level symbol names that are NOT declared (used by the resolver to flag invalid exports).
Implementation
Set<String> exportNamesNotDeclared() {
var all = _ownSymbolNames();
return _exports
.where((e) => e.path == null)
.expand((e) => e.symbols.map((s) => s.name))
.where((n) => !all.contains(n))
.toSet();
}