Errors: {
}
method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr() → dynamic
  return let final dart.core::Set<dart.core::String*>* #t1 = dart.collection::LinkedHashSet::•<dart.core::String*>() in let final dynamic #t2 = #t1.{dart.core::Set::add}("a") in #t1;