Errors: {
}
method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr() → dynamic
  return block {
    final dart.core::Set<dart.core::String> #t1 = new dart.collection::_CompactLinkedHashSet::•<dart.core::String>();
    #t1.{dart.core::Set::add}{Invariant}("a"){(dart.core::String) → dart.core::bool};
  } =>#t1;