Errors: {
}
method /* from org-dartlang-debug:synthetic_debug_expression */ debugExpr() → dynamic
  return () → dart.core::int {
    return this.{#lib1::B::x}{dart.core::int}.{dart.core::num::+}(this.{#lib1::B::y}{dart.core::int}){(dart.core::num) → dart.core::int};
  };