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public struct Pair<T,G> {
        T v0;
        G v1;
      
        Pair (T v0, G v1) {
          this.v0 = v0; this.v1 = v1;
        }
    
        Pair.empty () {}
    
        public T first () {
          return v0;
        }
        public G second () {
          return v1;
        }
}

public static int main(string[] args) {
  var b = new Pair<int,string>(4,"test");
  string s = b.second();
  return 0;
}

got free(): invalid pointer fish: './template_struct' terminated by signal SIGABRT (Abort)
I think the problem is with string because if write int i = b.first(); then everything works fine.
Vala 0.44.5